In contemperory world if we observe the working of some muslim groups, who are hell bound to spread their version of Islam by force, then it seems that Islam was spread through sword.
On the other hand if we observe the life and teachings of Sufia in this part of the world, then it seems that Islam was spread through love, kindness and humanism.

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/// Aur be ghum hain zamanay main muhabat kay siwa ///