The Bible teaches that when a man and a woman are united in marriage they become ONE.  The same principle apply wen a person receives Jesus as a personal Savior. Years ago a young Christian author wrote,

“Someone says “I am lost whenever I think of Christ and myself as two,” and it seems so to me now. Think over the expressions “Christ, who is our life;” “Alive in Jesus Christ;” “He that hath the Son hath life, & he that hath not the Son hath not life;” and many others like them, and tell me if you don’t think they teach a most marvelous and glorious reality? Our only life is Christ, and in Him “dwelleth all the fullness of the Godhead bodily!” It almost takes my breath away to think of anything so glorious! Surely this will answer every question about our individuality, our independent will, our fighting etc.
The grand fight of all our lives is, as you say, with Amalek and other enemies which typify the flesh. It is not the temptations of the flesh we are to resist, so much as the flesh itself, the legal element in our natures, which is continually turning us back to reliance on the flesh. Our fight is emphatically a fight of faith not a fight of effort. It is a fight to cease from effort in fact and to suffer another life to be fully worked out in us. And I think a deeper typical meaning than has ever been discovered yet, must lie hid in Israel’s old contests.”
—To a Friend, March 28, 1867
Hannah Whitall Smith and Melvin Easterday Dieter, The Christian’s Secret of a Holy Life: The Unpublished Personal Writings of Hannah Whitall Smith (Oak Harbor: Logos Research Systems, Inc., 1997).