Marrying an unbeliever could be the first step towards an unseen danger. Please to do not minimize this Moshe. Marrying out of the truth could cause an unwary Christian to develop a satisfying sex life which could deaden their sense of urgency, dulling thier spiritual vision. Some may even go so far as slowing down in theocratic activities, perhaps missing meetings or field service because of selfishly pursing fleshly pleasures with their spouse.