Here are 2 Bible verses about people lacking faith, curated from both the Old and New Testaments of the Holy Bible, King James Version, arranged from most to least relevant.
Hosea 4:6 KJV
6 My people are destroyed for lack of knowledge: because thou hast rejected knowledge, I will also reject thee, that thou shalt be no priest to me: seeing thou hast forgotten the law of thy God, I will also forget thy children.
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Genesis 1:1-31 KJV
1 In the beginning God created the heaven and the earth. 2 And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters. 3 And God said, Let there be light: and there was light. 4 And God saw the light, that it was good: and God divided the light from the darkness. …