Beyond consistency, have you found his argument to be rational, logical and scientifically sound?
It is scientifically sound so long as you define human life in biological terms only. It is not if you believe that a human is a sentient being, or that the soul has entered the body. I believe you and I discussed that concept at some length.
Murder implies malicious intent. Do you think those who have abortions do so out of malice? I don't. Certainly its premeditated but the act of having an abortion is not done out of malice.
Still, it is the deliberate taking of a life. What would you call it? It isn't (usually anyway) self defense, nor is it a legal execution. If the zygote is a human, it is innocent and not threatening anyone's life, then killing it has to be murder. What other term could apply?
A deranged person who kills a child because of a belief that he/she harbors an evil spirit is not malicious intent, is it? Is it still murder?
Also, there are 3 legal degrees of "Murder", first, second and third degree. Which one are you suggesting applies to abortion?
Logically, having an abortion involves planning and carrying out the taking of an innocent life. Isn't that first degree? I'm not a lawyer, but I believe that is the definition of first degree.
If someone planned and carried out the killing of a child who had already been born, wouldn't that be first degree murder?
Additionally, there is the matter of birth control "creating a hostile environment" that ensures the death of any zygotes (fertilized eggs), could the act of making, selling or taking birth control be construed as Conspiracy to commit murder?
If those zygotes are human beings with the same rights as anyone who has already been born, then yes.
Wouldn't poisoning someone's environment in some way, say for example introducing a toxin into their food supply, be a similar thing? Surely, the law would call that murder. As for conspiracy, the suppliers of said toxin, if they realized the purpose for which it was to be used, would be guilty of conspiracy.
As for birth control, if it is to prevent conception i.e., the pill or a condom, then that isn't killing anything. The so called "abortion pill", on the other hand might be considered tantamount to putting poison in someone's food.
That is, if you buy into the idea that life begins at conception, and therefore, a zygote is already a human being. That is the crux of the question.