Is he who watches and listens to lectures about death, Paradise, and Hellfire, yet persists in committing abominations during times of weakness and solitude, considered among the people of deviation and error? And is a person's return to sin after abandoning it evidence of a lack of resolve?

He who hears admonitions yet falls into sins due to weakness of self is not necessarily among the people of deviation (zaygh) and misguidance (ḍalāl). The distinguishing mark of the people of deviation is following the ambiguous (mutashābihāt). As for one who commits a sin, acknowledges it, and regrets it, he is a disobedient Muslim who needs repentance and seeking forgiveness.

Ibn al-Jawzi mentioned in "Zād al-Masīr" that deviation (zaygh) is doubt or turning away from guidance, and that the people of deviation may include the Khawārij, the hypocrites, the delegation of Najran, or the Jews.

Misguidance (ḍalāl) refers to an unintended scientific error, whereas transgression (ghayy) is misguidance committed intentionally and for gain.

The person mentioned cannot be definitively described as being among the people of deviation or misguidance. Rather, it is more appropriate to focus on inviting him to Allah and urging him to repent.