It has been a frequent occurance which i have carefully observed.I happen to be a frequent traveller,and in virtually all of my trips i have observed that christains seem to publicize their religion more often in the buses,streets and many other places.The case is not the same with the muslims.So my question to the muslims is could it be that islam is somewhat a selfish religion or could it be that sharing their belief with people of different religion is not part of their obligation to allah? Please note,no offenses or disrespect mean't to any religion whatsoever.