P2 is where your argument falls. Not only is it ludicrous to refer to a being with no cerebral context as "innocent", but also I would not agree with your use of the term "human being" in this context. Please define it, preferably in a way that does not include the unused product of IVF treatment or HeLa cultures unless you want to make murderers out of thousands of lab technicians and research scientists.I don't think you need any recourse to scripture to demonstrate that abortion is immoral. A simple syllogism can do it:
P1) Intentionally and directly killing an innocent human being is wrong.
P2) Abortion intentionally and directly kills an innocent human being.
C) Therefore, abortion is wrong.
You can even frame the argument legally is you prefer:
P1) The law should protect the lives of innocent human beings.
P2) Abortion kills innocent human beings.
C) Therefore, the law should protect innocent human beings from abortion.
I would also quibble with your P1. I think there are occasions where killing an innocent human being is not immoral. Again, definitions of "innocent" as well as "human being" would be important.