Contradiction with Romans 3:10
Psalms 15:2 describes a righteous and blameless person, while Romans 3:10 states that there is none righteous.
Romans 3:10: As it is written, There is none righteous, no, not one:
Contradiction with Ecclesiastes 7:20
Psalms 15:2 speaks of a blameless walk and work of righteousness, while Ecclesiastes 7:20 mentions that there is no just man on earth who does good and sins not.
Ecclesiastes 7:20: For [there is] not a just man upon earth, that doeth good, and sinneth not.
Contradiction with Isaiah 64:6
Psalms 15:2 emphasizes speaking the truth, but Isaiah 64:6 says all our righteousnesses are as filthy rags.
Isaiah 64:6: But we are all as an unclean [thing], and all our righteousnesses [are] as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.