If I were an Atheist

[Tonus]

No because I don't merely lack belief in Santa I firmly disbelieve.

On what basis do you disbelieve?

However as I have pointed out its not unreasonable to believe the universe and our existence was caused by a Creator and I have offered evidence in support of that belief.

I have yet to see evidence offered that wasn't either emotional to some degree, or depended on one or more logical fallacies, or which ignore considerable problems that are usually hand-waved with an argument that cannot be falsified.

I don't attempt to disparage atheism by claiming they have no evidence in support of their belief and that they're just as liable to believe in santa claus and fairies as believe in the idea we owe our existence to non-God forces.

There are many beliefs for which we lack evidence of the kind you seem to be referring to... including the belief that Santa Claus or the Tooth Fairy don't exist. On the other hand, science has discovered a great deal about our world and our universe and how they might have formed, and as yet there are no explanations that require god.

I believe there is sufficient evidence in favor of theism over competing explanations but insufficient to prove it beyond a reasonable doubt. I'm not suggesting the approach should be abandoned.

That's why we're here in a discussion forum, to test those explanations and see what stands up to scrutiny. To date, I have not found many (if any) that are very compelling once they are put to the test. I don't expect that I ever will, but then again I felt similarly when I was a theist, and yet here I am.