It makes perfect sense. If science has proven anything, it's that all living beings are made of cells. Since there are one cell organisms floating around on the planet, it is safe to assume that single cells started this whole shit. We haven't been like we are now forever, because they know there were other creatures similar to modern humans that weren't the same species. They have proven that by studying DNA, skull and jaw structure, bone formation, etc. Which means that we evolved from some other beings, which means they most likely evolved from something, and so on and so forth.
i see that evolution is the most logical possibility, but not necessarily the truth.
at the end of the day you will never know until you die what is really up and even then you might not know.