Some Christians believe the Bible and their directives from God should control everything they do. But when our Founders designed the Constitution, they deliberately created a government that would NOT be directed by Biblical or other religious directive but rather by the rule of secular law.
That is not to say our Founders weren’t God-fearing and Christian, most were. But looking to government to follow and enforce Biblical and Christian beliefs is fallacy. The Bible can control YOUR life all you want it to, but not our Government. Jesus is not President.
Where does that come from? What does it even mean? Values must be informed by something. A society must be governed by shared ethics to be free. A society governed soley by "laws" rather than ethics will always become authoritarian. Always have and always will.
I would also note that secularism is also a religion. Yet one with absolutely no basis or foundation for objective morality. “An evil man’s ways are right in his own eyes.”