Bible Verses About Unbelief: Questioning the power of God

Then the captain on whose hand the king leaned answered the man of God, and said, Behold, if Jehovah should make windows in heaven, might this thing be? And he said, Behold, thou shalt see it with thine eyes, but shalt not eat thereof.

Yea, they spake against God; They said, Can God prepare a table in the wilderness?

Behold, he smote the rock, so that waters gushed out, And streams overflowed; Can he give bread also? Will he provide flesh for his people?