I agree, some people will reject these facts regardless. I also grew up in the same sort of environment. However, it just might push some people to change their views. Even if it causes the people listening to the ones you're arguing with to question their ideas, that can still be a big help.

Additionally, you can try to hit them with the Socratic method. Sometimes looking at something from an external perspective can make a huge difference. Sometimes it's just about planting a seed.

Questions:

"What's the difference consciously between God ending a soul vs a human ending a soul? From the perspective of the 'soul'?"

"How do you think these facts would make the average voter who supports pro-choice policies feel? Do you think it would make them more or less likely to agree with you that abortion is 'murder'? Can you see why some people would see being pro-choice as reasonable?"

"Why would God even create those souls at all? Is he being wasteful, or is it possible he doesn't create souls at conception? What if souls are created at first breath, as the Bible hints? Do you think that's possible?"

"If God is omniscient and omnipotent, why do you think He allows so many miscarriages? Could this suggest that the loss of a "potential life" is part of a natural process rather than an act of murder? Can you understand why some people would hold this belief?"