Are you absolutely sure about that statement since most our DNA is bacteria in origin.
No, it's not. (Unless you mean by cell count, and then that's true only because most of the cells in your body aren't your body at all, they're the bacterial passengers we all carry.) Prokaryotic gene sequences are very, very different, in structure and regulation, than the sequences of eukaryotes. For instance, in bacteria related proteins are likely to be directly downstream of each other, and subject to combined regulation (the lac and trp operons are the classic examples of this.) That's rarely the case in eukaryotic genetics.