Most religions dont force you to convert; you may or you may not at your choice.
In India people converted to Buddhism because they liked Gautams teachings; heck even the barbarian Mongols were civilized by Buddhism. However it left them naked to Islamic sword which is merciless and just kills.
This is a hungry sword; after it has killed all others then it turns within and kills its own members in the quest of "purity" like we see with Taliban. It is always in a blood letting mode.
