The idea of God always existing

[Voltair]

So God's creation is the beginning of time and before that there is no time. However time is simply a construct we invented to measure things. The point is if God has always existed without explanation or without cause why is it invalid to postulate a non-deity based idea with the same quality? What makes it a unique claim to God?

You have offered up an idea about it but why again is this uncaused cause a deity? If we remove physics from the equation aka pre-universe who is to say that the uncaused cause in a sense is a fluctuation in matter or something else? How does one give personal characteristics or deity based characteristics to this cause? I will freely admit to you that science does not have the answer to the cause of the universe yet.

However arguing that an abstract idea was the cause isn't the same as proving that same idea. I freely admit that it is possible that a deity is the first cause I just don't see how it is possible to prove it. This is why I classify myself as an agnostic atheist. To be honest I don't see major differences between agnostics, deists, and atheists save the fact that two of them believe in some form of deity but don't necessarily have a way to prove it or even care to a lot of times.