Hmm here is an idea. What if we made a religion that was against open carry and was technically Christianity? Could we use the veto power religion now has over the Bill of Rights?
No. Religious arguments against abortion are actually relying on the definition of what constitutes a life, not the pure fact that their religion says it's wrong.
You can get out of military service this way though.
It has nothing to do with the possibility of ending a life, otherwise republicans would actually care about what happens in schools (be it shootings or diddling, republicans are OK with them happening in schools).
Republicans are hardly a monolithic entity. Some may care about ending lives, but only ones that have nor been convicted of a crime. Others may care about ending lives, but not as much as they care about their right to firearms. Others view it as a religious issue. Others want women to be broodmares.
For the record, all of them are fundamentally disrespecting another person's autonomy, but they can have different reasons for doing so or priorities when doing so.
How is that any different? It's still their religion that says when life begins. Other abrahamic religions do not believe that life starts at conception.
While the argument for life beginning at conception can be rooted in religious texts, it can also be based on the desire for simplicity of argument.
I.e. not wanting to pick a random day during the term of the pregnancy to serve as a cutoff point, because the development of a fetus doesn't have a convenient place where you can say "5 minutes ago, this thing wasn't alive. Now it is. "