Hell naw man. You're trippin. Please tell me a team sports rule that overruled a constitutional right?
There's no more fundamental right than the First Amendment, it was the whole reason that America was founded. But a private contract can stipulate that you not wear any religious apparel or not preach religion in the work place. There are obvious exceptions like they're not gonna tell a Muslim woman take off the Hijab for the bad press, but they will tell you to keep the Jesus pamphlets at home.
Similarly, you're not allowed to say whatever you want at work despite what you're saying being protected by the 1st Amendment.
You give up your 4th Amendment rights when you agree to a drug test, that would otherwise be an unreasonable search. When you agree to a lack of privacy of your work emails, that's you conceding your 4th Amendment rights. I can go on and on. You give up your 7th Amendment right to a Jury trial when you agree to arbitration. It's just goes on and on. That's the point of a contract. you give and you get.