I have definitely narrowed it down to atheist, Christian or Jewish though I am leaning more tow Jewish. If anyone knows feel free to tell me. Don’t mind the flair I just picked a random flair. Thanks.

Ethnically Jewish (if your mom is Jewish you’re considered Jewish), but I don’t know if he’s religious at all.

I heard somewhere that bj was Jewish. Which if true, is awesome in my opinion.

I don't remember where, but I believe he and Set talk about it. Jewish, but not practicing.

In the Machine Games timeline, he's confirmed as being Jewish by descent (because his mother is Jewish), but he doesn't demonstrate any particular religious practice. I don't necessarily think he's an atheist, so much as just not practicing any particular faith.

He's ethnically Jewish, but religiously I think he's either Jewish or Catholic.

I don't think he's atheist. In TNC prologue he mentions going to heaven or hell, with no attempt to distance himself from the fact that those are judeo-christian notions.

In the machine games timeline he has a Jewish nom but sounds more like a american christian. In the older ones, no idea, he is pretty much a gun with a name. Blaskowitz is a Slavic last name so he should be partially Slavic as well

As everyone's said, Ethnically Polish Jewish, but I'm thinking probably more culturally Texas Protestant.

But the biggest thing is "so why did his parents get married? The money? But it wouldn't be that far across cultures surely"

BJ is Jewish in an Genetic sense, which makes it finny when Nazis see him as a “shining example of aryan purity” but I don’t think it’s touched on in game if he practices

He talks about his faith in TNO. He’s ethnically Jewish, but he could be religiously catholic or Jewish.

It's implied in TNC that Rip Blazkowicz did marry Zofia for her family's money. Then he squandered it.

I don’t think he’s particularly religious but his mother was Jewish, and he took part in (presumably) Catholic prayer with Anya and her grandparents — and either Baptism or Catholicism would have been a nearly omnipresent factor in life in early 1900’s Texas.