Why was Maimonides controversial?

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 7-All Jews must accept the 13 Principles of FaithControversial when proposed. 

Luminaries such as Hasdai Crescas and Yosef Albo asked: Is the rest of Judaism any less important? All agreed that the principles are indeed in Judaism, but many were uncomfortable with the idea of a formal creed, that would separate “good” Jews from “heretics”. More importantly, Judaism stresses action, that is commandments, not belief. Belief is not central in Judaism. Your thoughts are your own, and you are not accountable for them. So Jews ignored the 13 principles for many centuries.