...abortion isn't named in the bible as a sin. if so show me where that is by name...
It kind of feels like maybe you are more looking for an argument here, rather than discussing ways to witness to the unsaved who have different ideas than we do?
One thing I've already clearly said above is that if something is a sin God will have told us so in his word either directly or in principle. Do you agree with this? Or do you believe that we as Christians are given the authority to decide for God what is sin? The comparison to abortion has no place here since there is clear scripture telling us that murder is sin. A person can argue over when a fetus becomes a person thereby making killing "it" a sin of murder, but I don't think that's the topic here.
that doesn't mean we should do it...
Of course it doesn't. I thought that was made clear by Paul's words which I already quoted above.