I’ve seen a lot of INFJ’s on here that say they ere christian. It seems to be connected.
I don’t think it is. AFAIK, English-speaking Tumblr users tend to come from countries that have majority Christian populations. As such, suggesting that it has something to do with MBTI is a bit like showing up at a meeting of the Westminster Kennel Club and going “Woah! Every blue-eyed person I’ve met today owns a purebred dog! Weird!”
It would be just as easy to say that an INFJ’s uncanny intuition draws us to the more esoteric religions. Or that our ability to see straight to the heart of something makes us able skeptics and naturally draws us to Atheism/Humanism.
INFJ’s tend to have well-defined personal values that we passionately defend (mostly in writing, because that’s where we’re best able to express ourselves). Last time I checked, Christianity didn’t have a monopoly on conviction.
TL;DR - IMO, Suggesting that MBTI has something to do with what religion someone chooses is a false-equivalence.