True - there was no attempt made to spread Hinduism by sword unlike Islam/Christianity.
If it was spread by sword, India would be muslim, and no other faiths would be spared from remaining intact. India was under muslim rule for well over 600 years, yet there remained those who practiced Hinduism.
The brutality has been one sided. Jews, Muslims, and Christians alike were massacred by Knight Templars during their Crusades/Conquests. When Salahuddin conquered Jerusalem, all those who were seiged in the Holy City were free, and could either stay or migrate.
Hinduism never spread by sword, because it didn't have to. It's a remnant of Paganism (belief in many different gods, and their worship). Much of the world was pagan before the message of monotheism came in the specific shape of Judaism/Christianity/and Islam.
Islam has spread, but for a majority of the time it has been embraced, not imposed. Case in point, today's USA and Europe.