Whether you are religious believer or an atheist, it’s galling to realize that some people are feigning religious objections to COVID-19 vaccines to avoid compliance with mandates. And since the law requires that religious beliefs be “sincere,” it’s tempting to argue for strict policing of the legitimacy of requested objections.

On closer examination, however, the right course is actually for employers and government to defer to individuals’ claims of religious exemption, no matter how implausible they may seem.

The principle of freedom of conscience means that the final judge of what’s in your conscience is, well, your conscience.

So a person willing to base an exemption request on religious belief should get the exemption, regardless of whether you or I might think the person has made up the religious motive as an after-the-fact way of avoiding vaccination.

Litigation around religious exemptions to many laws is almost never focused on the question of sincerity. Instead, disputes tend to be about how far the authorities must reasonably go to accommodate the exemption claim, or whether the government has a compelling interest in denying a particular exemption.

And that’s the way it should be, no matter how extreme it may sound to defer to people’s mere assertion that they are motivated by conscience. For these purposes, the federal statutes that enable exemptions are not only legally binding, but morally correct. The moral basis for religious freedom is the idea of the liberty of conscience, which motivated the framers of the First Amendment to the U.S. Constitution and remains compelling today. That’s the notion that human beings possess an inherent right to make their own decisions about ultimate questions of the kind addressed by religion.

A famous modern formulation is that of U.S. Supreme Court Justice Anthony Kennedy, writing in the 1992 Casey v. Planned Parenthood case upholding the right to an abortion: “At the heart of liberty is the right to define one’s own concept of existence, of the meaning of the universe, and of the mystery of human life.”

The core of the liberty of conscience is the idea that only I can decide what my conscience requires. It’s a spectacularly individualistic principle, one that a utilitarian who likes to add up costs and benefits for everyone might well question.

If I say that my conscience requires me not to be vaccinated, then no one else is in a position to tell me that my conscience is wrong.

When it comes to my conscience, it doesn’t matter if I thought something different last year or last week or 30 seconds ago. What I believe right now is what matters.

People who decide first that they don’t want to be vaccinated, and then search online for religious authorities who might back them up, aren’t thereby disqualified from legitimately claiming to be protected by the liberty of conscience. They are doing what many before them have done — and exactly what religious liberty is supposed to protect.

At this point you might be thinking, “What about somebody who doesn’t believe in religion at all and is just plain lying about needing a religious exemption?” It may sound counterintuitive, but as a matter of moral logic, even the atheist who is claiming a religious exemption should be able to get it.

After all, what’s so special about religious belief that would make it uniquely deserving of legal protection? A deeply felt atheistic belief held in good conscience deserves the same protection as a deeply felt religious belief.

That’s implicit in the idea of conscience, which need not be derived from God to be valid.

In recognition of that moral truth, modern law protects even atheistic beliefs that play the role that religion plays in the life of the believer. A pacifist atheist was as legally entitled to conscientious objection from the military draft when the U.S. had one as a religiously motivated pacifist.

The upshot is that, if you think exemptions based on conscience are ever morally correct, then you should let people decide for themselves what they actually believe, not second-guess them. Only sincere beliefs must be respected. But sincerity is in the mind of the believer, not the eye of the beholder.

Noah Feldman is a Bloomberg Opinion columnist and host of the podcast “Deep Background.” He is a professor of law at Harvard University and was a clerk to U.S. Supreme Court Justice David Souter.