On the issue of abortion, yes Baptists have a common belief with the RCC as compared to the SDA. However, that one issue does not make the RCC any closer to the truth of Scripture than the SDA is. They are both basically cults, for different reasons.
We should also make note that although the bible is clear on the issue of abortion (murder) and life beginning at conception, there are many even on this board, who although being Christians, choose to ignore the bible on these points. Many Christians also ignore God's Word when they yoke themselves together with political parties which openly condone abortion and homosexuality. I will not be a member of a church which condones such sins, nor will I be a member of a political party which condones such sins either. I really don't understand why any Christian would.