This is a subject that I have always had the same feelings on, although my perspective has changed over the years.
When ds was a baby, we had no religion, and our non-religious parents all celebrated Christamas, Easter, etc. Ds's great grandpa even has a real beard and plays Santa at parties, etc. But dh and I thought that so much of what AP is, is repspecting ds as a whole person and not belitteling him just because he is a kid. How could we respect him if we were lying to him about something so silly as bunnys/tooth faries, etc? So we decided not to do it. Obviously, he would know who they were, but we would never perpetuate the lie and we would always tell him the real truth.
Then, we bacame Christians who celebrated the Christmas/Easter holidays. We decided even stronger no Santa/bunny beacuse it drew away from the real meaning of our holiday, had pagan roots (bunny and eggs are pagan symbols, etc), and was breaking a commandment by lying to our children, and the Bible says to hate magic.
Now, we are all-out Christains, who have stopped celebrating the man-made, pagan-turned-Christian holidays for many Biblical reasons and are now reading about how to go back to celebrating the God-ordained days He gave His people in the OT, so Santa/bunny are entirely out of the question.
I know, I just keep getting weirder and weirder, but I am on a quest for the truth, I guess. I totally understand where everyone is coming from, cuz at different times in my life I have felt the same way. I remember finding out that Santa was fake as a child, and I just thought "well, that was stupid!" I don't think I ever got anything out of it.