However, I don’t think Buddhism has much of a history of violent conquests. As I said before, it does not believe in evangelization (which is really the great motivating force behind the bloody and violent conquest by Christians and Muslims). I think Buddhism is really a peaceful religion.
Even today, one hardly hears of any killings or atrocities by the Buddhists. If I had to adopt a religion, I would adopt Buddhism.
Buddhism does preach peace.
From a BBC article on this topic.
BBC - Religion & Ethics - Buddhism and war
A quote from Buddhist scripure:
"In times of war
Give rise in yourself to the mind of compassion,
Helping living beings
Abandon the will to fight."
However, from the same article:
"But Buddhism, like the other great faiths, has not always lived up to its principles - there are numerous examples of Buddhists engaging in violence and even war.
In the 14th century Buddhist fighters led the uprising that evicted the Mongols from China
In Japan, Buddhist monks trained Samurai warriors in meditation that made them better fighters
In the twentieth century Japanese Zen masters wrote in support of Japan's wars of aggression. For example, Sawaki Kodo (1880–1965) wrote this in 1942:
It is just to punish those who disturb the public order. Whether one kills or does not kill, the precept forbidding killing [is preserved]. It is the precept forbidding killing that wields the sword. It is the precept that throws the bomb.
Sawaki Kodo
In Sri Lanka the 20th century civil war between the mostly Buddhist Sinhalese majority and the Hindu Tamil minority has cost 50,000 lives."