If I were an Atheist

[Tonus]

The point is if neither side has enough evidence to prove their point then all the two sides have is a difference of opinion.

Based on that reasoning you would have to relegate nearly every single mythical god and creature to "opinion" status... including Santa Claus.

If I believe that something doesn't exist, and you cannot prove it does, then it's not unreasonable to believe that it doesn't exist. If sufficient evidence becomes available to prove its existence, then belief becomes the reasonable approach. This is how we operate in pretty much every other facet of our lives. Only when it comes to the possible existence of god(s) do we abandon the approach that has worked very well for us otherwise.

Most of the gods that people believe in today were very bold and active in the distant past, when the lack of longevity and technology made it nearly impossible to verify such claims, and when the lack of knowledge and understanding made it much more likely that those claims would be accepted at face value. The more we resolved those issues, the further and further into the background the gods faded, until we live in a world where "god" is intangible and utterly undetectable in any possible way save for those which can only be verified on an individual basis and must, like the claims of old, be taken at face value. If we have to revert to that mindset to find god, then that is a very big problem IMO.