You don't convert to Atheism, it is not in itself a belief, in fact it is quite the opposite, it is an abscence of belief.
Take me for instance, I do not believe in the existence of God as defined by the Jewish, Christian and Muslim faiths so does that make me an atheist ?
In the narrow mind of some people the answer would be yes but to me they are wrong. I just happen to believe Man invented God...not the other way around.
I am a Pagan, not one of these modern pagans that seem to think that Paganism is some sort of ancient religion which they are trying to invent.
It isn't and never was, but that wanders away from your question.
The only advice to give in situations like this is you obviously have questions in your mind that need answers.
Keep asking those questions but listen to the answers with an open mind.
I have my answers, and that is I discovered a long time ago how simple things became and how much easier they were to understand once I removed God from the equation.