Do YOU have to end the relationship right now.................. or could you two possibly agree to date others and still see each other without such a strong commitment standing in the way or creating fear / doubts?
Just asking as to put the ideal out there - some people can do this type of dating and live a happy life at the same time.
LoVe,
Rhapsody -
P.S.
IMHO - I too feel that the difference in faith could and very well might create undo stress / conflict later on in life for the two of you.