Dooley, but why invent for a thing that doesn't need a cause an other thing (god) that doesn't need a cause?

My statemant that god needs a god was from JulzMighty's assumement that everything needs a cause but that god lives "outside causality" and doesn't need a proof and I disproved it by showing its contradictions.

As Tiles said, the big bang is the BEGIN of cause and doesn't need a cause.