Many Christians misunderstand the relationship between morality and religion. Many mistakenly believe that morality is the same thing as religion and, therefore, mistakenly believe that they should not advocate for policies that reflect their moral beliefs. But morals and religion are not the same. And since morals and religion are not the same, basing our decisions about public policies, laws, or elections on beliefs that derive from religious convictions does not constitute an unconstitutional establishment of a state religion.
All laws reflect or embody someone’s morality. The moral views of people who hold theistic worldviews are no less valid in the public square than the moral views of those who hold atheistic worldviews—which, of course, are faith-based also. The Establishment Clause of the First Amendment was intended to prevent the establishment of a state religion, not to prevent religious beliefs from informing political decisions.