Satan rejoices when we have questions or doubts about God; He hopes that we can never find our way back. So the thought that Satan is so elated means that he knows that God as something special for you.
Doubts are the biggest thing that Satan uses against children of God if you doubt the existence of the living God. If you believe that God causes all the problems of this world, then your faith would have been shaken to the core.
Sometimes it feels like you’re all alone, but you are not. Others are struggling just like you, and, most importantly, God is with you. These moments of doubts, wandering and confusion are evidence of God at work in you, not His abandoning you.
What does the Bible tell you about being doubtful?
James 1:6 But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.
Proverbs 3:5-8 Trust in the Lord with all thine heart; and lean not unto thine own understanding. In all thy ways acknowledge him, and he shall direct thy paths. Be not wise in thine own eyes: fear the Lord, and depart from evil. It shall be health to thy navel, and marrow to thy bones.
No matter what you are going through, remember that trust, without doubt, will allow you to see the miracles that God work into your life. Your faith in God keep the Devil out of your life and ensure that he has no influence to cause chaos around you.
James 1:5-8 If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be, given him. But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed. For let, not that man think that he shall receive anything of the Lord. A double-minded man is unstable in all his ways.
Isaiah 41:10 Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.
The book of Romans 8:28 And you know that all things work together for good to those that love God. And to those who are, called according to his purpose.
Romans 8:39 Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.