That's not true at all. As far as I am aware only the Roman Catholic Church believes this as doctrine, and it's not a traditional viewpoint at all- it was only promulgated as doctrine in late Medieval times. As late as 1312 the Council of Vienne upheld the doctrine that ensoulment occurs after conception. Of course, the Catholic Church changing its mind is inconsistent with its claim to uphold an unaltered apostolic faith, so it lies and pretends it has always believed that ensoulment occurs at conception.
Regardless, Christians have always upheld elective abortion at any stage to be a sin.