This has been debunked on numerous occasions, and maybe this is just a funpost and I'm just being a spoilsport, but:
Individual sperm =/= human being
Individual egg =/= human being
Egg + sperm --→ human fetus
Under increasingly disturbing circumstances, only the 3rd of these items would be considered full-on cannibalism.

Here's the thing, everyone who accepts that science is a valid basis for an argument doesn't believe that abortion is murder. People continue to believe this though, because its virtue signaling. It just feels so good to declare yourself morally pure without actually doing anything that helps anyone Also evidence is unnecessary, their faith tells them to believe in a point never mentioned in the bible.

To be honest, the bible isn't even 100% clear that murdering children is bad, so long as they're your kids. Or so long as you're God, obviously, because he can summon bears to kill children because they made fun of one guy for being bald.