Actually if it can be shown that certain sub-elements or events cannot happen then we can be very certain that there is no way for the super thing to occur either. This eliminates your uncertainty either way.
You say that abiogenesis and common descent are separate issues. I do not see it that way. Firstly in order for you to have common descent you first need to have a living entity. The evolutionist is painted into a corner here.
If you do not know in what shape or form the first life arrived, you cannot make the undisputed claim that life then proceeded to multiply according to the descending scheme. But, be that as it may, if you assume a first life then it necessarily has to have replication built in. But more importantly you now are left with the requirement that new functionality has to be constructed, tested and integrated into an existing life form in order to advance to the next step.
Again, here you have to assume certain abilities or limitations in the genetic make up of that first life - and you just do not know. How scientific is that?
So my point regarding the separation of abiogenesis and darwinian evolution is this - they are both reliant on random physical processes that have to generate information or knowledge which is an abstract entity. How is that going to happen? I therefore make this statement - Darwinian evolution is true if and only if abiogenesis is true.
One can visualize the requirements placed on these supposed random processes by simply viewing the rather splendid videos of un-imploding a building here https://www.youtube.com/watch?v=0beiA-qZ2p0 and here https://www.youtube.com/watch?v=AHZzdN2TLic.
Basically this is what people are requiring from those random processes - the equivalent of buildings arising from the storm of dust and debris into fully functional units - all by themselves. Just think about what the end result represents - think of all the conceptualization, planning, aquisition of materials, building ( where does the knowledge and means of the arrangement of physical elements come from) and finally commisioning of the systems within and outside of those buildings. That last bit also includes the integration of the infrastructure with the surrounding environment, plus the start of and continuation of the management of the building.
Now that lone building would represent the equivalent of new Darwinian functionality for an organism.
For the equivalent representation of abiogenesis, one would have to envision the whole town or city arising from a huge dust storm and debris all on its own because that is just how complex even the most simple self-reliant single cellular organism is. There cannot be anything simpler or else it will be a dependent parasite or just dead.
I’ve used these videos and those buildings as the analogies for what people are really asking of Darwinian evolution and abiogenesis because it can be quite difficult to see the bigger picture if you’re buried under a whole lot of red herring details.
Those videos should also spell out the absurdity of what is required - clearly buildings cannot arise from a random physical storm and heaps of rubble into a fully functional unit all by itself, yet this is precisely what evolutionist want people to believe!
I know that there’ll be all kinds of reasoned and logical sounding responses to this posting. The fact will remain though that whoever believes in abiogenesis and Darwinian evolution wants the world to believe that buildings and cities can arise out of tornadoes, hurricanes, earthquakes and other random physical processes all by themselves, i.e. purely random physical /chemical processes can create, store, retrieve, decode, use and maintain information - which is an abstract entity - all by itself.
To spell it out for clarity sake - the information regarding the materials and their composition that are required e.g. cement, water, gravel, steel, how much, what quality, what sizes, what strength, what shape, what durability, the timing of the arrival of that material, when it’s to be inserted and how and with what tools and for how long etc. The information regarding the use of that functional unit - how does it get integrated with existing items, how is it activated and the functionality utilized for the benefit of the existing infrastructure. How is it decommissioned if need be. Etc.Etc.
It should be clear that what happens in the cell and the body far exceeds the simplistic organisations humans have put together - and those took a great deal of conceptualization and planning to achieve. So it is simply a task to far to ask of random processes to create what goes on in the cell and body. If you disagree - well then the building and city builds itself out of the dust storm. Your choice.