Bible Verses About Skepticism: General references

Who is the Almighty, that we should serve him? and what doth it profit us if we pray to him?

Who said to God: Depart from us: and looked upon the Almighty as if he could do nothing:

A psalm for David. Lord, who shall dwell in thy tabernacle? or who shall rest in thy holy hill?

Unto the end, in verses, understanding for David.

And it shall come to pass at that time, that I will search Jerusalem with lamps, and will visit upon the men that are settled on their lees: that say in their hearts: The Lord will not do good, nor will he do evil.

And you have said: What have we spoken against thee? You have said: He laboureth in vain that serveth God, and what profit is it that we have kept his ordinances, and that we have walked sorrowful before the Lord of hosts?