I see nothing reasoned there.....how is "abiogenesis" superior to "deity" in filling the gap regarding the origin of life?.....
Abiogenesis is bringing life from something not living. The christian god making Adam from dust is abiogenesis.
How is a non-theist abiogenesis superior? Because a theist abiogenesis asks more questions that it answers. It is obscurum per obscurius. For instance, if life required a god to bring it into existence, what brought the god into existence.
You are, I presume, aware that the building blocks for life, complex proteins, have been recreated in a lab. Full, independent, life forms haven't yet, but then nature had millions of years, and few science tenures last that long.
how does the fact you make your own moral choices contradictory to a religion that actually teaches that we must make our own choices regarding a belief in deity?
Because making your own moral choices involves just that. Using a moral code supposedly created by a sky-lawgiver (although actually created by man many years ago) doesn't involve any personal moral decisions to be made, except one...do you accept the god's morality.
......and finally, how do you pretend there is a rational basis for the statement " nihilistic reality of existence".......
If there is no deity, then innately nihilism exists. Now, if you can provide evidence of a deity.... (beyond pretty sunsets or the complexity of organic things)