YES! A Christian can marry and date a non Christian. Firstly....who is a Christian?
A Christian is a person who seeks to live his or her life according to the principles and values taught by Jesus Christ.
Where did the word "CHRISTIAN" came from?
In Acts 11:26, the disciples of Jesus Christ were called CHRISTIANS first in Antioch.
Now! Let's look at marrying a non Christian. In Genesis 41:45, Joseph married the daughter of pharaoh, Asenath who is a pagan(idol worshipper) and yet their marriage flourish and later got converted (Genesis 48:8-22).
Exodus 2:16-22, 3:1 Moses got married to Zipporah, the daughter of Jethro who is a pagan priest and yet God bless their union and they multiply while doing the work of God .
Hosea 1:2-3 God instructed Hosea to marry a prostitute named Gomer, He obeyed God and married her and later Gomer got converted and became a new person (Hosea 2:16-23).
When you carefully go through all these Bible verses, you'll discover that divine connection and marriage are possible whether it's from the same religion or not, God has a way of connecting us for his own purpose in order for us to fulfill our assignment in the life of that person, country and the world at large.
SHALOM