Macro evolution assumptions:
1) Uniformitarianism... the rate of growth/change is the same now as it has always been. I think it was Charles Lyell who got in to this idea.
Problem: Start putting catastrophic events in this please! It doesn't allow for what happens with disasters and such when landscapes are drastically changed within weeks and possibly days.
So maybe a mountain is changing at such and such a rate-- and projecting that back would give millions of years.. but this would not account for the very high possibilities of earthquakes.. volcanoes etc.. causing rapid change to that same mountain.
Maybe this mountain rapidly grew and then settled at the rate it is now at? Or grew slow.. then rapid.. then slow...?
2) One species actually becoming a different species. Adapation-- that is real.. this is variations in species... different dogs.. different cats.. different horse etc...
But there are no COGS or DATS
3) To begin with, when people were postulating millions of years.. they didn't have the tools to measure it! It was a GUESS. They were assuming things and then looking for what would confirm it.
4) Most evolutionary theory would eliminate the possibility of supernatural intervention from the very outset. So the assumption is that the supernatural can't happen before even looking at the science. Is this fair?
There are also others.. but don't come to mind right now.