Evangelicals should be the last ones to moan about pagan and unbiblical traditions. They’re very far away from Apostolic tradition and practice as understood by the disciples of the Apostles. 

They can clamour all they like about only obeying the Bible and being led into the truth by the holy Spirit, but when these same major denominations disagree sharply over fundamental doctrines and come to polar opposite interpretations of the same verses then they should shut up about what is or isn’t Biblical. It’s clear none of them actually has a clue. 

This image an example of the kind of “research” many Fundamentalists engage in. This image from the book The Two Bablyons by Alexander Hislop and it been thoroughly refuted and rejected by modern scientific scholarship.