"A little leaven leavens the whole lump." Therefore if you find a religion that (a) claims to be entirely and uniquely true and (b) teaches ungodly ideas, such as shunning or dying for a misunderstood and obsolete dietary restriction, then the religion is false.
Of course if you realize that there is no one true religion, but in fact that religion is made for man, and not man for religion, then you are welcome to take part in the religion of your choice, or in none at all. Unless that religion insists that you must believe it entirely - not even harboring unspoken doubts - in which case it is clearly not the place for enlightened individuals.
A God who can't get by without our worship is not worthy of it. No just God would require us to pick one church as flawless when all are flawed, and then punish us for not picking the right one.
Bodhisattva - Please, guys, tell me how to join the UADNA