Why are Jews more devoted to their religion than Muslims?

Even though the Jews have worked sincerely for their falsehood, gone far astray, and achieved great dominance, their end is to vanish. The reason for their dominance is the Muslims' retreat from world leadership. Sincerity is only commendable if the work is righteous, in fulfillment of the Almighty's saying: "And the [good] end is for the righteous."