AJEY: ok, than let me to help you with your logic
as christianity has largest no. of followers in todays world, so why not this a true religion at all??
and as christianity is biggest religion of todays world, it means few decades or a century earliear it was the FASTEST GROWING RELIGION for centuries, does this means christianity was true religion than time and now become false religion??
and when christianity was a FASTEST GROWING RELIGION than time Islam was a FALSE RELIGION and now it become true religion?? How can a false religion be comes a true religion, if it grows fastest? How can a true religion becomes false, if it grows fast or faster??

Since the inception of Prophet Muhammed (SAW) the growth of Islam cnt be compared to any other religion. Christian are more today cos they've been in existence about 570 years b4 Islam. And look at the margin today, its not much. In the next 100 years, surely Islam would have surpassed