The traditional Catholic teaching is don't marry outside the faith, period. I, personally, was at one point mildly rebuked in the confessional for marrying an Episcopalian. I have a very conservative (but 20th century) catechism at home which insists that a person "seriously keeping company" with a non-Catholic must mention it in confession.
As long as both of you are Christians, then that's OK.
It is NOT scriptural for a Christian to marry a non-Christian.
The Catholic Church permits interfaith marriages as long as the Catholic spouse agrees that the children will be raised Catholic.