If any of you lacks wisdom, let him ask God, who gives generously to all without reproach, and it will be given him. But let him ask in faith, with no doubting, for the one who doubts is like a wave of the sea that is driven and tossed by the wind. For that person must not suppose that he will receive anything from the Lord; he is a double-minded man, unstable in all his ways.
We all have doubts about certain things, but doubting God should not make that list.
When we go to him in prayer, we should be able to ask him for help with confidence.
Trusting God, who can do all things, is going to be a requirement throughout our lives.
Doubting him shows lack of trust, reliance on him for everything should be our goal.