I don't think that makes a ton of sense to try to answer. If god made the universe, then he clearly wasn't there when he made it.
I don't believe that's a valid criticism. Cause and effect do require sequence, but I don't think they have to have time in the way we experience it. It's like asking how an individual was born. Time as a perceptional concept doesn't exist to a person before they were born, but time as a physical concept does. In the same way, time as a physical concept depends on a universe, but time as a logical concept does not. Time is connected to the universe, but that doesn't help it move past a need for a first cause.
I think I can. Atheist want to argue about the null being that god doesn't exist. Essentially we shouldn't believe something interesting occurred unless we have enough evidence to think so with confidence. We have no evidence that things can happen without cause, so it doesn't make sense to assume they can. The universe is a giant Rube-Goldberg machine, and science depends on our ability to ascertain previous steps by looking at present conditions. The moment you start introducing causeless effects, things risk breaking down.
I've yet to see anyone show evidence of a state without a cause. That's why I say it's undisputed.