Atheists, tell me, a Roman Catholic: why should I become an atheist?

[Catholic_Lady]

The difference between saying God has always been here and saying something in nature has always been here is that God is supernatural. That's the whole point of God - a being that is beyond our natural world and its laws. The laws of nature, as far as we know, state that everything has a beginning. Just as there is no "proof" of God, neither is there "proof" that anything in nature can be infinite, having no beginning. Either way you're taking somewhat of a leap of faith by making either claim.

I am not making that claim, though. 

Fair enough.

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The difference between saying God has always been here and saying something in nature has always been here is that God is supernatural. That's the whole point of God - a being that is beyond our natural world and its laws. The laws of nature, as far as we know, state that everything has a beginning. Just as there is no "proof" of God, neither is there "proof" that anything in nature can be infinite, having no beginning. Either way you're taking somewhat of a leap of faith by making either claim.

First of all, simply stating that 'god' has always existed, adds nothing. It has no explanatory power, and creates more questions than it answers.

What sort of realm did your god exist in before he created the universe?

If existence did not exist, what was your god acting on when he created the universe? Causation requires time and space. What time and space existed for your god to cause something to exist?

What sort of leap am I taking by positing that existence always existed?

Sorry, but your tu quoque fallacy is unconvincing. Neither is your argumentum ad ignorantiam.

My bold. 

Of course. But so does saying that anything in nature has somehow always existed.