Don't pretend this applies to just religion.
If you openly declare your belief in alchemy, alien abduction, astrology, the Easter Bunny, fairies, ghosts, holocaust denialism, karma, the Loch Ness Monster, magic, moon-landing-hoaxism, 9/11 truthism, reincarnation, Santa Claus, telepathy, thetans, unicorns, Yahweh, or the Yeti...
...then those who fight on the side of reason may show you less respect than you think you deserve.