Yes. Scripture teaches that believers wrestle not merely against flesh and blood, but against spiritual forces of darkness.
That does not mean every problem is a demon, and it does not excuse sinful choices. But marriage, covenant, family, forgiveness, purity, repentance, and unity are all areas the enemy seeks to attack.
Spiritual warfare is not about fear. It is about standing firm in Christ, putting on the armor of God, rejecting lies, praying faithfully, and refusing to let bitterness rule your heart.