He is only doing what his religion preaches. Afterall it is the religion of peace.
Also I have full confidence that Islam will be the biggest religion in the world one day and this can be proven scientifically...
We all know that as per law of nature, everything in this universe has a tendency of going from a state of high order (which is equivalent of Hinduism) to a sate of total anarcy (which is islam).
Right now Hindiusim is still the largest religion in the world when you include its ancillairy religions like budhism, sikhism, jainism etc and also counting that over a lakh people per annum recoinvert to hindusim in Indonesia, but ultimately islam will spread all over and that will be very near to pralay, thereafter there will be a new begining which will start from high order (needless to say hindusim)