There are three causes why people renegade and leave the fold of Islam:
1) Poverty (Ghurbat) – This is a leading cause.
If we will ignore the poor class on the assumption that they are poor, then, the false and deviate forces (batil) will draw them away from Deen using wealth.
2) Free time.
If we leave out that group which has free time and is unoccupied, on the assumption that they are free, then again, evil practices, etc. (batil) will occupy their free time drifting them away from Deen. So we cannot leave out any class whatsoever.
3) Ignorance (Jahaalat).
If we leave out the ignorant, on the assumption that they are ignorant, then, because of their ignorance, false and corrupted ideas (batil) will cause them to abandon Deen.