Why do you say that? If they are saved by grace through faith...wouldnt they still be in good shape? If they "believed" in him, wouldnt they be saved? Or are you saying that they have to haved behaved a certain way..? Is their salvation then, believe in him, AND love his sheep? Faith plus works?
“Belief” in Christ means total belief in all he preached to us, not just going to a church.
The “Christian” monikker you hung on those that abused the Jews was solely based on the church they may have attended, or simply once been there to be baptised, not a confession of Jesus Christ as lord of their life, and savior of their immortal souls.
You hve no evidence of a sincere confession.