Reply #59: What does it mean to say secular?

[More Than A Feeling]

Suppose I'm a legislator. I want to offer a bill that says any hungry person who can't afford food should be given food. I do so because I believe in Jesus Christ, and that He requires me to do to the least of these as I would do unto Him. Nowhere is this motivation written in the bill, but I fully acknowledge my motivation in all the speeches I give concerning this bill.

If the bill passes, would said law be constitutional or unconstitutional?

If it would be constitutional, what would be an example of an unconstitutional bill? If not, would religious people be forbidden from taking part in political life, because it would be impossible to tell when they were acting based on religious motivation?