I don’t know, man. There’s a Church of Atheism, but as far as I know there’s no Church of Humanism. I think you may have things backward.
I fixed me grammar.
Here is one church of humanism:
Atheists who are guided by a deeply held belief, such as those in the Church of Atheism, (i.e., that our lives should be guided by science, reason, and reality), could conceivably have a constitutionally protected religion.
But simply not believing that there is a god, is not a religion. (I’m not saying that I like that religions get extra protection than persons with no religion.)
edit: i thought i needed to correct a typo, but i didn’t