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> just because someone claims to be a Christian doesn’t mean they are.

Externally it pretty much does. Unless you have some specific concrete evidence there's not really ever value or reason to claim someone isn't part of the religion they say they are.

If you are _also_ part of the religion they claim then you might have some interest in whether or not they adhere to your doctrines but to outsiders it's all opaque and irrelevant.