The key reason I became atheist is because I found the argument that any known religious ideas are not demonstrated by science. Yet, it has recently come to my attention that this is probably the wrong way of looking at religious ideas. The reason is because they are metaphysical in nature, and it appears that science can't actually tell us much about them. So, I wanted to look at how people typically view other metaphysical things. This brings us to numbers*. Numbers are possibly the most "true" thing humans have an idea about with any sense of objective and fundamental nature of reality. So, I want to better understand exactly what that idea is, and then apply those same rules to spiritual and religious ideas. For example if we can say that numbers are a fundamental truth to existence (which we might not be able to say) because they provide a framework of coherent description of natural phenomena, in my estimation it is appropriate to say that a particular religious idea would be a fundamental truth to existence if it also provides a framework of coherent description of natural phenomena. Granted, there may be some fatal flaw somewhere in there, and even if there isn't I have a feeling that any non-numbers framework would be far too open to interpretation, but still I want to give the idea a go.

*Initially I said "mathematics", but derived from what MMM said, it appears that it might be more appropriate to think in terms of numbers instead of math.