Overcoming disbeleif is hard. Many of us struggle giving 100% of our beleif to God. We struggle with thinking if He can handle our problems. Maybe if we keep a hold of something to worry about, it gives us some sense of control. The truth is we have no control. Our only choice is to trust.
I pray that the eyes of your heart may be enlightened in order that you may know the hope to which he has called you, the riches of his glorious inheritance in his holy people, and his incomparably great power for us who believe. That power is the same as the mighty strength he exerted when he raised Christ from the dead and seated him at his right hand in the heavenly realms.
Ephesians 1:18-20
10Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.