You said we could imagine different laws of physics, and I simply pointed out we can imagine different Gods too. But in reality, the laws of physics are what they are. They are immutable. Maybe gravity works differently in other universes, but even if so, that doesn't preclude a set of laws, perhaps the laws of quantum physics, being true throughout the omniverse. I'm not just making this up--this is what actual cosmologists think. I can't pretend to understand the physics, but this is a pretty accessible article covering the scientific landscape with regards to this question as of 2015. The reality is that many of the people who study the origin of the universe, people who are far more expert than you or me, do not think God is a necessary first cause, and indeed think some set of laws (quantum or otherwise) are sufficient. It's possible they are wrong, but do you really think they are making an obvious logical error? Or consider professional philosophers. These a...