Also as someone who was a member of church which had anti-christian ideals, pointing out the hypocrisy can be the only way for them to question what they are in. Doing and saying nothing helps no one.
There's a large middle ground between saying nothing in the face of bigotry and proceeding immediately from "oh you're a member of <group>?" to an itemized list of hypocrisies, without stopping to find out what the individual person in front of you actually thinks about said hypocrisies. All I'm advocating for is that last: talk to people like they're people, not like they're mindless members of <group>.
Also as someone who was a member of church which had anti-christian ideals, pointing out the hypocrisy can be the only way for them to question what they are in. Doing and saying nothing helps no one.