Very likely. Religions are prone to that, these threads being perfect examples of that.
But don't think the Protestants are not in it. Take for example Christmas being on December 25th? It ain't biblical but the Prots accept it. I have yet to read a Protestant thread that calls Christmas a spurious and a speculative date. :)
I don’t exclude Protestants but one group doesn’t claim to speak for all and it’s really too diverse to lump together.
As for the Christmas date I’ve written about much of the popular versions being unrelated to the actual Biblical narrative and the general reaction has been, ‘It don’t matter!’.