Christmas trees aren't a Christian symbol. They were a pagan symbol, appropriated by Christians and applied to a Christian holiday, trying to rebrand the pre-existing pagan tradition.
Similarly, cherubs aren't a Christian symbol. They were pre-existing figures in ancient Roman art, that pre-date Christianity. Their widespread use in Christian art and iconography are just an appropriation.
Just like how images of crucifixion aren't Christian but are appropriated from pre-existing images of Dionysus, who was part of a trinity and did miracles associated with wine. Christianity isn't actually Christian. . . .