1) Sort of like ItcheSrulik said, it’s very likely that he was just pandering to the cultural biases of his time to make his works popular without having a confirmed belief in them. Which brings us to:”
He had no need to write anything at ALL about Jews. His plays were already successful. I guess we could debate this ad nauseum.
Some people feel Marlowe WAS Shakespeare. Their styles were similar. Personally, I love S’s works. The stories have withstood the test of time and have often been updated to make modern movies and shows out of their plots. “West Side Story” was a retelling of “Romeo and Juliet.”