Imān (faith) is dynamic, capable of increasing and decreasing based on a person’s actions. Engaging in righteous deeds and obedience to Allāh strengthens one’s Imān, while committing sins and neglecting religious obligations weakens it. In severe cases, persistent sinful behavior and abandonment of obligatory acts can diminish Imān to the point where it is nearly extinguished.
This concept is supported by the teachings of early Islamic scholars.
For instance, Al-Awzaa’ee, a renowned scholar, was asked about Imān
“Does it increase?”and stated:”Yes, until it is like the mountains.” He was then asked, “And does it decrease?” He said, “Yes, until there is nothing left of it.”