I'm not asking believers, especially muslims, why you think Islam is successful, because you'll just answer "It's the true religion/Allah is the true God"
I'm asking fellow Atheists (or realistic agnostics/believers, as much as they may exist) why you think Islam is successful.
Psychological, sociological, cultural, economical, political reasons.
Is it because, unlike Christianity, it makes its believers feel good about themselves and justified?
Because it makes men proud and glorifies their masculinity and power over women and non-muslims?
Because it makes living in shithole desert countries bearable with promise of afterlife and earthly power and conquest?