This actually has been a highly discussed issue in my former church.
I have heard church members talk about how they broke up relationships between believers and non-beiievers with with prayer.
When I was a very new Christian, a pastor insisted that I dump my girlfriend because she wasn't a...
This why one has to rely heavily on divine guidance and advice from a competent Christian counselor before tying the knot with someone. Much misery can be avoided this way.
It's ironic how many preachers are anti-science, when some of the greatest scientific discoveries have been made by Christians. (i.e. Isaac Newton, Michael Faraday, Francis Collins)