DNA are the fingerprints of life. When those fingerprints show that humans are related to bacteria it is immaterial what came between. The relationship of all life on Earth to each other tells the story. All life on Earth started with bacteria and they still are the most dominant of life forms here. Humans are a complex multicellular form of bacteria and the result of over 3 billion years of evolution.
Well you've raised a relevant point here I admit that but it isn't what it might seem, or at least I don't think it is, I've looked at this before.
You assume that similarities
prove relationship but they do not, they might and in some cases do but unless you can
prove that there's no other away for some gene to exist in a human and a gorilla other than a common ancestor then it is just supposition.
I also admit that it is reasonable to do what you say, it is reasonable to infer common ancestry between different organisms that share some identical genes or gene sequences but it is not proven, that's the important epistemological point here - similarity does not prove common descent, it is consistent with it (as I've said numerous timers here evolution is reasonable, there are many observations that appear consistent with evolution, but it is the areas of
inconsistency we must examine if we seek truth).
Finally speaking of bacteria, listen to this summary of the evolutionary clock based upon what the fossil evidence actually reveals, here the history or life is represented by a 24 hour clock.
Youtube
As he explains if 24 hours represents 4 billion years (approx. how long life had been present) then for the
first 21 hours we had only bacteria and other very simple life, then in the space of the
next 2 minutes almost known phyla arose, that is some 40+ phyla (basic body plans like mollusk, crustacea etc).
This is pretty much what the evidence indicates, this is why it is called an "explosion" this is what it is described as "sudden" - these are terms used by paleontologists incidentally, these are not laymen's terms.