Bible Verses About faithlessness

Hear the word of the LORD, ye children of Israel: for the LORD hath a controversy with the inhabitants of the land, because there is no truth, nor mercy, nor knowledge of God in the land.

I tell you that he will avenge them speedily. Nevertheless when the Son of man cometh, shall he find faith on the earth?

For what if some did not believe? shall their unbelief make the faith of God without effect?

And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.

If we believe not, yet he abideth faithful: he cannot deny himself.

But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.