Something else to consider - from my experience the majority of christians don’t make it their entire identity. After all, do not pray for others to see, etc. etc.
People you know to just be regular peeps who are pro choice have a decent chance of being christian, just the shut up and love thy neighbor type, as opposed to the “LOOK AT ME, IM SO CHRISTIAN” type.
So there are two axis in which people can be overlooked and quiet - one for religious affiliation, one for their stance on abortion.