Naturalistic biogenesis happened
Definitely. There is no question in my mind. The universe follows rules. Life is as natural an occurrence as salt.
The big bang came out of nothing
I can't speculate on this because my knowledge of "nothing" is based on my model of this universe. What triggered the big bang was most likely not definable within this model.
An infinite number of big bangs have occurred
I can't speculate with any accuracy about such a thing because I do not know what triggered the big bang. (Read above.)
We exist in a multiverse that string theory is uncovering
I think our concept of "universe" is too restricted to start diving into "multiverse". However, I do believe that string theory is developing a method of describing how time and space are interwoven. This may reveal a multiverse, but not in the traditional sense, I don't think.
I love speculating but i still do not know the answer
Guessing is what makes theoretical physics fun. I love to speculate, but I don't love purporting "truth" that is only defined by speculation.
God did it dummy
Anyone who can look at single leaf and believe that a god had the capacity to expertly craft and care for it is a fool.