That’s a pretty poor excuse since the meme makes a statement presented as factual that falls apart upon scrutiny. Without this connection, the meme is nothing.
Secondly, the meme isn’t actually funny, it just validates the previously held beliefs of this community. There is no joke, just a poorly argued “gotcha”. Validation feels good, but it’s not actually humor even if the two is often confused.
It doesn’t fall apart on scrutiny you’re just too dense to understand it’s not about dates of paintings and Christianity is largely based on other religions beliefs that christianity literally appropriated.
Jesus wasn’t the first to walk on water or turn water into wine and he sure as hell wasn’t born in December.