Fred,
You act like scientists are afraid of discussing abiogenesis, or that is some kind of Achilles Heel in the Atheist worldview (and please say Atheist when you mean Atheist rather than using Evolutionist). This is simply not the case. All that is going on is that we are trying to maintain meaningful definitions.
Evolution is usually used to describe Darwins theory of descent by natural selection or, more commonly, a modern varient on that basic principle. Abiogenesis, however it happened, can never be explained by natural selection; because until we have a replicator there is nothing for natural selection to act on.
This is why Evolutionist insist on seperating Evolution and abiogenesis; because the issues involved are wildly different.