Jagger is reveals a great deal of ignorance, both historical and constitutional.
The first Amendment prohibits the Federal Government from establishing a religion and protects the rights of individuals to freely exercise their own religious preferences. Printing "In God We Trust" does not establish a state religion, such as the Church of England, which was the model the framers had in mind and wished to avoid. There is no state clergy, nor are their state churches, nor is anyone prohibited from choosing to following (or not follow) a particular religion.