Edgar:
There is no rule that says atheism has to be reasonable.
“The fool hath said in his heart, There is no God” - Psalm 14:1
I note that posters who are theists may or may not make a leap of faith as to the truth of macro evolution.
Not so with atheists; they are all in. Why?
I think that atheists (wrongly) think that the macro evolution idea gives them some hope at a coherent worldview. They are like the tower of babel builders who, like all of us in their desire to find perfection, thought if they could just build this thing high enough then they could reach the transcendent by their own wits and efforts. In their pride and hubris, they babble on.