It's pretty simple.
Creationists need to find flaws in Evolutionary Theory because it challenges their faith in a literal interpretation of the Old Testament, specifically the Book of Genesis.
It would not matter how many gaps there were in the stages of evolution of hominids or any other species; Creationists would still demand ever smaller increments to link the gaps.
They forget - or don't know - that we now have the means to map RNA and DNA lineages.
They may not realise the degree to which evolution is linked to geography and climate.
Often, they are so concerned with defending their faith that they never consider studying science at uni and examining the evidence we have.
As far as I can see, it is futile to try to persuade them. After all, they have a right to believe as they do.
