I thought your god was keeping you safe

[Guard of Guardians]

... There is good reason to believe in one and little to no reason to believe in the modern conception of Santa Clause... 

Could you list a few of these reasons.

And welcome to the forums.

#1 - The fact that the entire time-space universe came into existence a finite time ago.  (Related to the Cosmological argument)

#2 - The fine-tuning of the constants and quantities of the space-time universe that make intelligent life even possible in this universe.  (Fine-Tuning argument)

#3 - The complex information contained within DNA. (Intelligent Design and/or Teleological argument)

#4 - The applicability of mathematics to the physical world - the mathematical structure upon which the universe seems to be based.  (Argument from applicability of Mathematics)

#5 - The reality objective moral laws & duties.  (The Moral argument)

#6 - The historical reality and authenticity of the existence, death, and resurrection of Jesus of Nazareth.  (Argument from the historicity of the salient details of the life, death, and post-death appearances of Jesus of Nazareth).

There are other logical arguments as well...  Philosopher Alvin Plantinga can give well over two dozen arguments, few if any of which have been refuted.  If the logical arguments go through, so that the conclusion follows directly from the premises, then they constitute genuine evidence, unless or until a substantive objection is made and can be sustained to demonstrate why the argument does not go through.

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All that has realistically happened is that theists have erroneously convinced (deluded) themselves into believing that they have evidence for god's existence.

That's an interesting assertion, but it doesn't happen to be true.  The existence of God makes sense of the reality in which I live.  The non-existence of God does not.  Who's deluded?