Studies have shown and edicts from above state that you don't trash/speak poorly of/ try to proselytize others' religion. You're getting mighty close to the line.
Well, not exactly.
We can trash talk all the other religions ^outside^ of Christianity (including Judeaism and Mormons).
We are left to respectfully struggle with the differences among traditions (denominations) in the Christian church. Giving honor and due respect to the faithful confession of one baptism, one Faith, one Lord.
- Hat tip, Saul of Tarsus