If Islam were so swell, God would not have sent Christ Jesus, nor would he have He been judged on the Cross, nor would he have been resurrected.
Given time to incubate, Islam will spread as a contagion of plague-like proportions.
Islam popped up six centuries after Jesus. Mohammed mixed Arab paganism, some Rabbinic Judaism and elements of Gnostic Christianity together and turned that all into Islam. The concept of jihad was the only way he could make Islam spread.
If Islam were so swell, God would not have sent Christ Jesus, nor would he have He been judged on the Cross, nor would he have been resurrected