True, but that wasn't what I meant when I said that the "Greek spawned Christianity". In my mind, the Greek heritage came later, through St Augustine and other philosphers. They relied heavily on Greek philosophy to construct and validate the Christian view of God and the world.
Why wasn't Christianity more popular among the Jewish people? The Bible has some theological answers to that question. I wouldn't consider a Greek heritage to Christianity to be a main cause of that though. Jesus and the apostles were all Jews, after all.