How are the first amendment rights seen in the constitution? Like how congress can't change religion

What does the first amendment say?

https://www.google.com/search?q=first+amendment&ie=&oe=

Is the Constitution the ultimate law of the land that even Congress must obey, or is it optional? Can the Congress pass laws about who believes what, regardless of what the Constitution says? Can the Congress make it illegal to be Catholic or Jewish or Baptist and say everyone must be a Presbyterian or a Jehovah's Witness?