How does one define "religion"?
Is the basis a "belief in higher power"?
Even if that "higher power" is considered "man"? Or the antithesis of "good," evil?
Could Nazism be considered a "reigion?"
How stupid do we want to get about sanctioning "religion"?
Depends upon whom you get to decide what is and is not a "religion". They you'll REALLY see stupidity.
As an alternative, why not simply allow people to worship as they choose, or not, so long as they do no harm to the rights of another person? They can establish churches and whatnot as they will, subject as always to fraud laws and tax laws as appropriate. The government, other than taking care to enforce the laws regarding fraud and murder (among others), does not elevate ANY religion over any other in preference or law, and simply stays away from it altogether.
Oh, wait...that's how it's SUPPOSED to be anyway!