etc - they were all Jews trying to figure out how to stay Jewish in the face of Hellenistic culture's onslaught. Organized religion need not be as monolithic as you seem to assume. Maybe organized is the obscuring word. Think, instead, of religion rescued from the tide of now by a thick tradition. Anyone going forward must pay attention to and venerate what came before.
If you believe Jesus spent his time condemning Jewish thought in this sense, then you do not understand the gospels as well as you think you do. He was crucified not because he had abandoned the tenets of Judaism, but, rather, because he was so faithful to them, he became intolerable to a status quo and its guardians set in violation to the Jewish God's will. He was so conservative, he was subversive.