@Savings,
First off I would consider the passage : "Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? Or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? For ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. Wherefore come out from among them, and be ye separate, says the Lord, and touch not the unclean thing; and I will receive, and will be a Father unto you, and ye shall be my sons and daughters, says the Lord Almighty" (II Cor. 6:14-18).
The bible firmly tells Christians that they should not commune with non-believers.
This issue was even a concern in the Old Testament. When God was leading the Israelites into the Promised Land, He gave them strong commands about how they should deal with the pagan nations. Deuteronomy 7:3-6 says:
Do not intermarry with them. Do not give your daughters to their sons or take their daughters for your sons, for they will turn your sons away from following me to serve other gods, and the LORD's anger will burn against you and will quickly destroy you. This is what you are to do to them: Break down their altars, smash their sacred stones, cut down their Asherah poles and burn their idols in the fire. For you are a people holy to the LORD your God. The LORD your God has chosen you out of all the peoples on the face of the earth to be his people, his treasured possession.
So what do I think of a person who will only date Christians? I would think that the person is Christian, and they actually follow the Bible.