Dangerous assumption. You couldn't possibly know that. And we've seen many examples of the opposite being true.
This is true... but at the same time, we can never know what REALLY happens during catholic confessionals. Or if a teacher is really not discriminating against children based on race. Or if employers are really not discriminating against the physically handicapped. The truth is, we can't possibly know a lot of things for certain... we just have to take it in good faith.
The big deal is that a school which lives in tax dollars is running a bible study and prayer group. Aside from the human element--the possibility of students being pressured into praying against their will, or having to lie about themselves to fit in, or being punished for their beliefs
--it's in violation of the constitution.
How so? The constitution states that the government/establishment cannot show preference to any religion. Per the first amendment Free Exercise and Establishment clauses:
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof...
In
Reynolds v. United States, for example, the Supreme Court decided that
"it may be accepted almost as an authoritative declaration of the scope and effect of the amendment thus secured. Congress was deprived of all legislative power over mere [religious] opinion, but was left free to reach [only those religious] actions which were in violation of social duties or subversive of good order.”
Assuming the coach is acting in good faith and not discriminating against those who decide not to partake in the religious activities (and the fact that he has several non-christians as active members of the team, with no complaints filed, that would seem to be the case), then I don't see how his actions are in violation of social duties nor a subversion of good order.
To take it further: According to the cases of Tinker v. Des Moines, Bethel School District v. Fraser, and Morse v. Frederick, religious activites/messages may only be censored if they are classified as a substantial disruption, vulgar, or advocates illegal action (such as drugs).
Straw man. Nobody cares what anyone believes.
Then why is there such an uproar over these things? By its very concept, your argument "nobody cares what anyone believes" is flawed, because there have been wars over just that... terrorism over just that... beliefs. I mean, the holocaust was premised on the idea of a "master race"...