"something can't come from nothing" - why?
Our daily experience suggests a number of laws of nature that do not hold when you leave the scale off human experience. Move very fast and relativity bends our concepts of time and space. Look at the scale of atoms and concepts of waves and particles become tangled up. Look at a quantum field vacuum and you find virtual particles popping up out of nothing without cause.
Physics knows a number of laws of preservation, like energy, momentum, charge, etc. These are precisely defined and have so far been found to be true in all experiments. Still, no serious physicist would dare to make a statement about any of these laws of physics when you get close to the big bang. In the first moments of the universe, the conditions were simply so extreme that we do not know which of our laws of physics still hold. We do not even know whether the concept of "time" still makes sense when we reach Planck scale.
We simply don't know whether our everyday experience "something can't come from nothing" still holds at the beginning of the universe.
Philosophy is fundamentally the science of knowledge. What is knowable and why do we know what we know? There are indeed things we can't know, but not knowing the origin of the universe does not imply that there is something there. The fact that you can't imagine the universe spontaneously popping into existence out of nothing without cause or reason does not mean that it didn't do just that. That's not to say I believe it did. I honestly have no idea what happened. Maybe there was something you could call god. Maybe there simply was plain nothing. Or maybe the term "was" does not even make sense, because time does not reach the value zero at all.