Had we been buddhists, we'd definitely have converted to Islam by now. Or for that matter India would have been like Afghanistan now. This point is valid. I agree with it. Buddhism had spread extensively to the current day Pakistan and Afghanistan. University of Taxila in Pakistan was the centre of Buddhist studies in that era. Buddhism was the predominant religion in Afghanistan. But those regions couldn't withstand the Muslim invasion and massive conversion to Islam followed. A religion like 'Buddhism' which is mostly based on the philosophy of 'ahimsa' only just canont survive any external aggression.