Actually, creationists just kept backing up their objections to the theory of evolution until they finally seized on abiogenesis (which the theory of evolution has never addressed) as some sort of reason why the theory is flawed. But it's rather like objecting to meteorological theories because they don't address the genesis of the first water molecule.
It makes sense if you do not believe in God or intelligent design to extend evolution into somehow randomly creating the DNA molecule out of liquid soup which then happily spits out a human being a few billion years later through the process of evolution.
No, it doesn't make sense. You aren't "extending evolution" by conflating it with biogenesis theories, you are simply distorting it. Evolution is what happens when self-replicators are present. How the replicators got here in the first place is interesting, but no more necessary to evolutionary theory than the genesis of water molecules is to meteorological theory.
That was what I was taught in school growing up.
I keep hearing about these mysterious schools that conflated abiogenesis with evolution in the distant past. I'm rather up there in years, and I can't recall anything of the sort. If you were truly taught this, you were taught wrong. Happens sometimes. But your mis-education has no bearing on the science itself.