The poster has his First Amendment right to mock what others might believe in. But neither is he any appellate court to me. My only concern is to protect the right of all citizens not to have the beliefs of others shoved down their throats.
Normally, I am fighting off evangelicals or Jehovah's Witnesses, bluntly telling them that all their biblical fairy tales are basically hogwash. But recently I found an unusual situation defending the right of Christian parents not to have my own beliefs slipped like a mickey to them. Some school district in California put yoga on the curriculum.
Now if it is physical yoga and exercise, no problem. That can be totally divorced from its Hindu or Buddhist roots. But if they teach meditation....ah! That could violate church-state separation. I support Christian parents who object to that on the curriculum.