Single-issue abortion voting is outdated and pointless.  There are the other issues Christians should vote on. In the USA Christians often vote on the single issue of who they think will advance the cause of banning abortion the most.  This is perhaps THE major reason why Trump won his first election.  Evangelicals believed he would appoint conservative judges to the Supreme Court and overturn Roe vs Wade in the process.  And, unlike any Republican president before him he did deliver on exactly that.  As a result he is seen by many as the champion of the Church, and they turn a blind eye to all the things about him that are very much against Christian values.   However, whilst legal changes do have some affect on abortion rates, this is less than you might think due to travel. There is evidence that making social policy decisions may be even more important.  Whilst the data is debated (as is often the case) there is some support for the idea that under democratic presidents, who try to look after the poor, abortion rates have fallen faster than under republicans.