What does the Bible say about religious depravity?

Religious depravity refers to the condition of the human heart, which is corrupt and unable to seek God on its own. In Mark 2:17, Jesus explains that he did not come to call the righteous, but sinners to repentance, indicating that all have sinned and fallen short of the glory of God (Romans 3:23). This state of sinfulness affects everyone, regardless of their external religious observance or moral standing. Isaiah 1:6 poignantly describes humanity's spiritual ailments, saying, 'from the sole of the foot even unto the head there is no soundness in it but wounds and bruises and putrefying sores.' Hence, understanding religious depravity is crucial for recognizing our need for Christ's righteousness.