I doubt that even one evolutionist understands it for the simple reason that they can't explain it.
Of course YOU can explain abiogenesis to us, can't you? Tell us how an oxygen free atmosphere allowed the proper sequences to combine without and ozone (oxygen) layer to stop the destructive UV radiation.
What about deep underwater vents, where sunlight can't reach, let alone UV radiation?
If you want to have some fun, ask them to define evolution. They will go into conniptions before they answer you. They will also give you a dozen different answers in order to cover all the bases. In fact they are so dishonest, and so unwilling to be nailed down on a definition that when I post Darwin's definition of evolution they insult me! Here it is:
"It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependent on each other in so complex a manner, have all been produced by laws acting around us. These laws, taken in the largest sense, being Growth with Reproduction; Inheritance which is almost implied by reproduction; Variability from the indirect and direct action of the external conditions of life, and from use and disuse;. a Ratio of Increase so high as to lead to a Struggle for Life, and as a consequence to Natural Selection, entailing Divergence of Character and the Extinction of less-improved forms. Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows evolution."
From: Charles Darwin, "On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life"
Of course since there is no stated theory of evolution, it is impossible for it to be a scientific fact. You need a theory before you can have proof of it!