i said that there is nothing to start with. You say " mass of some sort = spontaneous generation / evolution". Well, were does that mass of some sort come from, it can't just appear out of nowhere. At one point in time there was nothing, not even a mass of some sort. So, this theory can't be right. If you think about it you can figure there had to be nothing at some point.
the concept of 'nothing' has been dicussed before lol, you could say the universe began with the big bang, or from creation (a god). before OUR universe started, you might ASSUME there was nothing, but you may be wrong again. there could be hundreds of universes just like ours. either way, thinking that it HAD to start with nothing will just make ur brain hurt, so just assume before all the universes started, there was an infinite period extending back to the beginning of TIME itself and before -- hence infinite(brains hurting now), and that period (aka nothing) ended when the first universe was somehow created. this period is insignificant to us, up to the time when the universe(s) was/were created, and it became something. we can not actually know that there was 'nothing' because we weren't there and we have no scientific evidence, we just assume.
from there, you have the big bang theory, you have the creation theory, maybe there are more im not sure.
once we have a universe, with planets, now life has to start some way. you could say life as we know it on earth started from spontaneous (random, hence out of nowhere) generation of 'RNA' (similar to DNA) which evolved from there, or a much simpler organism which was generated ( i think, im not too much of a biology person, more into math ) by the spontaneous generation of 2 proteins which yielded an organism -- and the organism used the energy from those 2 generated proteins to live and evolve over time. also you could say we were created by god, or some other being.
spontaneous generation is VERY UNLIKELY, and (if it happened) it likely took a VAST AMOUNT of time, and an ASTRONOMICAL amount of luck to create whatever we started at. it could even be such an unlikely happening (in RNA's case), that we may very well be the only living organism in our entire universe, or we could have some friends somewhere. it is simply chance. now, if there are hundreds, or thousands, or even millions of other universes, or if there are an infinite amount of universes/space (infinite always makes my brain hurt), then there are more chances of more beings being spontaneously generated.