The Rabbinical opinion is that the Roman Church was formed out of an attempt to split the Edomean Sadducees off from Israel. Hence Christian holidays are based on various Karaite systems rather than on Rabbinical Judaism.
Some Karaites resisted the Rabbinical influence and reclaimed an Israelite identity by mandating circumcision and Kabbalat Sabbath services. Others took the new approach so far that they abandoned the Tanakh and the God of Abraham Isaac and Jacob completely in favour of Luciferianism.
