I don't rule out completely changes within species.
From the very start you rule out the possibility that humans evolved from a common ancestor shared with other species.
All-encompassing grand gradualism from below that bacteria to a long rise to the present biosphere - without goal, without a plan, without guidance? I don't think so.
Why not?
Animals lived. They no longer live for some reason. If they are ancestors to modern animals, I would look in the direction to sudden alterations of some kind. Long steady gradualism, I don't think occurred.
But, hey, to criticize evolution is to not understand evolution here. So ...
Why don't you think evolution occurred?
What evidence would you need? What features would a fossil need in order for you to accept it as being transitional between us and a common ancestor with other apes? What shared genetic marker would you accept as being evidence of the same shared ancestry? Or does the evidence not matter?