I'm interested in why you "don't" believe in God. What are you looking for? It can't be proof because you already believe other things without proof. I'm just curious as to what's going on.
(Ducking out of character for a moment)
Well, it's quite simple. Many of the arguments used to defend the existence of God can also be used to defend the existence of Santa. That's because many of the apologetics that Christians use are rationalisations:
"God isn't a subject in a test tube."
"You can't expect God to answer a prayer and be at your beck and whim."
"Many people have had personal encounters with Jesus."
"Your prayers weren't answered because you prayed wrong."
"I feel in my heart that God exists."
In using the same arguments that Christians use, I'm demonstrating their flaws, highlighting them by showing how such arguments can also be used to defend a ridiculous proposition - ie, that Santa Claus is actually real.
If you're interested, you can see it done in detail here:
Jesus and Santa: a Parable on How We Dismiss Evidence
(Back in character, for the purposes of this thread).
So, can you prove that Santa Claus does not exist? People have said they can prove it and, as a Santaist, I naturally want to know the truth. If anyone can prove that Santa doesn't exist, I'd be happy to see it.