Religious Exemptions from Healthcare and Vaccine Mandates: Where Courts Draw the Line

How American courts balance sincere religious belief against public health requirements—and why the rules keep changing.

By Garret Merkley · Explainer · Jun 3, 2026

Branched from How Religious Freedom Shapes American Political Identity

Quick take

Religious exemptions from medical requirements exist, but courts require genuine, sincere belief—not just personal preference dressed up as faith.
The legal test changed significantly after 2021: employers and schools now face a higher bar to deny exemptions, shifting power toward religious claimants.
Courts distinguish between individual conscience and institutional religious practice, applying different standards to each.

A religious exemption from healthcare or vaccine mandates is a legal claim that a person's sincere religious belief prevents them from complying with a medical requirement—and that forcing compliance would violate their constitutional or statutory right to religious freedom. The person isn't arguing the requirement is unconstitutional for everyone; they're asking for personal relief. Courts and employers must then decide: Is the belief genuine? Does it truly conflict with the requirement? And does granting the exemption impose an unacceptable burden on others?

The Legal Framework: What Makes a Belief Count

The First Amendment protects religious exercise, but not absolutely. For decades, courts used the "strict scrutiny" test: a mandate could override religious belief only if the government had a compelling interest and no less restrictive way to achieve it. In 1990, the Supreme Court narrowed this in Employment Division v. Smith, ruling that a neutral, generally applicable law—one not targeting religion—doesn't need strict scrutiny even if it burdens faith. That meant vaccine mandates, applied equally to everyone, could survive even if they conflicted with someone's religion.

But Congress and states pushed back. The Religious Freedom Restoration Act (RFRA, 1993) and many state equivalents restored strict scrutiny for federal and state laws that substantially burden religious exercise. This raised the bar: an employer or school denying a religious exemption must now prove it has a compelling reason and no other way to achieve it.

Courts also scrutinize whether the belief is sincere and religious. A claim that "I don't trust this vaccine" is not automatically religious. But a claim rooted in doctrine—"My faith teaches that the body is a temple and I cannot accept a vaccine developed using fetal cell lines"—can qualify. Courts don't judge whether the belief is correct theology; they ask whether the person genuinely holds it and whether it flows from a faith tradition or sincere moral conviction based on religion.

The Turning Point: Biden Mandate and Employer Liability

The COVID-19 vaccine mandate for federal contractors and large employers (2021) sparked a cascade of legal challenges. In Groff v. DeJoy (2023), the Supreme Court clarified that employers cannot deny religious exemptions simply because accommodating them causes some operational inconvenience. The employer must show the exemption causes "substantial increased costs" or "serious disruption" to business. That's a much higher bar than "any burden."

This shifted leverage toward religious claimants. Before Groff, many employers denied exemptions citing workplace safety or vaccine effectiveness. After Groff, courts said: "Safety concerns alone don't override RFRA. Show us concrete, significant harm." The result: thousands of exemptions previously denied were approved or won on appeal.

Institutional vs. Individual: Different Rules for Schools and Hospitals

Religious institutions—hospitals, schools, nursing homes run by churches—have broader power to set medical policies aligned with their faith. A Catholic hospital can require employees to refuse abortion or contraception referrals; a religious school can enforce dress codes based on doctrine. Courts recognize institutional religious identity as a protected interest.

But individual employees and families seeking exemptions from secular employers or public schools face stricter scrutiny. A public school cannot simply deny a vaccine exemption because it conflicts with school policy; it must apply RFRA or state religious freedom law. However, public schools can still enforce mandates if they prove a compelling interest (disease prevention in a school setting) and no less restrictive means exist. The tension: Is virtual schooling a "less restrictive" alternative? Courts split on this.

Why This Matters and When It Applies

Religious exemptions shape access to healthcare, education, and employment. They matter because they pit individual conscience against collective risk. A nurse granted a vaccine exemption works unvaccinated in a hospital; a student exempted from immunization attends school during an outbreak. Courts must weigh: How much individual freedom can public health sustain? The answer has shifted. Post-Groff, courts favor individual religious claims unless the state shows concrete, significant harm—a standard many health agencies struggle to meet in court.

Exemptions apply most visibly in healthcare settings (hospitals, clinics), schools (K-12 and universities), and employment (especially federal contractors and large firms subject to RFRA). They also arise in military service, prison healthcare, and family law (parental refusal of treatment for children). The rules vary by jurisdiction: some states recognize only medical and religious exemptions; others add "philosophical" exemptions, which courts treat differently.

The Core Tension: Sincerity vs. Consistency

Courts try to separate genuine religious belief from pretextual objection. A red flag: someone objects to vaccines on religious grounds but accepts other medications, blood transfusions, or surgeries without complaint. If a person's stated faith prohibits "artificial' medical intervention but they use antibiotics freely, a court may question sincerity. However, courts also recognize that religious belief can be nuanced—someone might object to vaccines specifically because of their development method while accepting other treatments. The inquiry is fact-specific and often contentious.

Key Shift in Law

Before Groff (2023): Employers could deny exemptions for operational convenience.
After Groff (2023): Employers must show substantial cost or serious disruption—a much higher burden.
Result: More exemptions granted; fewer denials survive legal challenge.

Context	Legal Standard	Burden of Proof
Private employer (non-religious)	RFRA or state equivalent: substantial burden + compelling interest + no less restrictive means	Employer must prove substantial cost/disruption to deny
Public school	RFRA + First Amendment + state law	School must prove compelling interest in disease prevention; virtual school may be 'less restrictive'
Religious institution (hospital, school)	Institutional religious identity + RFRA	Institution can enforce faith-aligned policy; individual exemptions harder to win
Federal contractor/employee	RFRA + federal mandate rules	Agency must show substantial burden; post-Groff, exemptions often approved

Can someone claim a religious exemption if their religion doesn't explicitly forbid vaccines?

Yes. Courts recognize sincere religious belief even if it's not part of formal doctrine. Someone might claim that their faith teaches bodily autonomy or distrust of government, and that belief genuinely conflicts with a mandate. What matters is sincerity and connection to religion, not whether a clergy member endorses it. However, courts will examine consistency: if the person accepts other medical interventions without objection, the claim weakens.

What's the difference between a religious exemption and a medical exemption?

A medical exemption is based on a doctor's finding that a vaccine or treatment would harm the individual (e.g., severe allergy). A religious exemption is based on sincere faith or conscience. Some jurisdictions recognize both; others only medical. Medical exemptions are narrower and require clinical evidence. Religious exemptions are broader in scope but subject to sincerity challenges.

Can a school or hospital deny a religious exemption if it threatens public health?

Maybe. Post-Groff, they must prove a compelling interest (disease prevention in a school or hospital setting is strong) and show that granting the exemption would cause substantial harm. For example, a hospital might deny an exemption during a measles outbreak, but denying it during normal circumstances is harder to justify. The threshold is high; courts require concrete evidence, not just theoretical risk.

Do religious exemptions apply to children, or only adults?

Both, but differently. Adults can claim exemptions for themselves. Parents can claim exemptions on behalf of children based on family religious belief. However, courts sometimes intervene if a child's health is at serious risk—e.g., a life-saving blood transfusion. The balance favors parental choice in most cases, but not absolutely.

Has the law changed since COVID vaccines?

Yes, significantly. The Groff decision (June 2023) raised the bar for denying religious exemptions. Before, employers could cite operational inconvenience. Now they must prove substantial cost or disruption. This has made exemptions easier to obtain and harder for institutions to deny. However, the underlying RFRA framework existed before COVID; the shift was in how courts interpret 'substantial burden' on employers.

Sources

Employment Division v. Smith, 494 U.S. 872 (1990); Religious Freedom Restoration Act, 42 U.S.C. § 2000bb et seq. (1993)
Groff v. DeJoy, 143 S. Ct. 2279 (2023); clarified 'substantial increased costs' standard for employer exemption denials
Various state RFRA statutes and case law on religious exemptions from vaccine mandates (2021–2024)