A wife is bound to her husband as long as he lives, but if her husband dies she is free to be married to whom she wishes, only in the Lord. So biblically the bottom line for the follower of Christ is: Will you marry only a believer.
So a Christian is not free to marry outside the Lord. And what saddens me, Tony, is how many believers get so entangled emotionally with unbelievers that they either throw away their convictions or they stand on their head to see the other person as a believer when he is not. A mature believer will want his or her spouse not just to profess some kind of creed or be willing to go to church.
Even if we do spot a dashing Christian, the person may or may not have been honest on his or her social media profile.
A few years ago, an atheist friend of mine pointed at me with victorious venom when a documentary on Channel 4 indicated statistics that Christians lied than Atheists on dating websites.
And whether or not a relationship occurs from meeting – exit well with communication, honesty and a pinch of diplomacy.