Legal Question in Constitutional Law in Virginia

Re: Religious expression in the workplace

The First Amendment - like most of the Constitution - doesn't really grant rights to people. Instead, it restricts the power of the government to do certain things. If you were a government employee and your supervisors allowed private conversations (there are probably some jobs where banning them would be justifiable) then they would have to allow you to discuss religion.

You say you work for a franchise and that the business promotes Christian music, so you evidently work for a private employer. Your premise that where you work is a "public place" is thus not correct. The Constitution's requirements generally don't apply to private entities, so your boss can forbid conversation about certain topics while at work if he wants.

There are some nuances to this rule which might crop up under slightly different facts but, based on the facts you have given, I don't see a constitutional problem.