Aliens, dude. Aliens. Or Care Bears.
Either abiogenesis initiated the chain of life, or external unmeasurable forces did.
I'll admit... there is faith in science.
On one side of the faith is
the natural universe is systematically discoverable and accords with a consistent set of universal principles.
On the other is
The natural universe can be modified by an external, unmeasurable set of forces (either too subtle for us to measure*, or set/done in such a way as to be undetectable).
*although one has to ask; if it is too subtle to measure... then how much affect can it have on our macroscale world?
Science can only accord with one side. Without the ability to discover in any form - through direct evidence, or induction, or whatever principle of logic you are able to use... then we simply have no way of touching it.
The problem as I see it is that... the efficacy of the core assumption in science - the testability of the natural world is unquestionable - allowing us to achieve wonderous advancements.
Where as, with the latter... it is a gateway for any number of arbitrary assumptions. How do you figure out if what you're believing is right or not? As far as I can tell; you can't... it is a matter of faith.
Of course, I don't think you'd dispute much of what I've been saying (perhaps you'd like to offer another snide comment though)...
But I simply make the point; One core assumption is more reasonable and of greater efficacy than the other - and unfortunately are quite incompatible.
Also, I should reiterate the point of belief and confidence - the atheistic (is there a better word for the idea of 'independent of theism' rather than simply - without theism?) belief in abiogenesis (any many other things) is simply a confident belief, based on all the other stuff we've already described. Like the contigent belief that the sun will rise tomorrow - it can be overturned easily should evidence reveal strongly otherwise.