Brahmins were very much against Buddha because the warriors are not supposed to be priests; their duty is to fight. And when Buddha started preaching, this was against the whole tradition – he was trying to be a brahmin, and he was born a chhatriya. This is pure and simple rebellion. But Buddha was of great charismatic personality. He managed to influence millions of people, and when the brahmins saw that this man could not be destroyed by easy and ordinary means they started organizing Buddha's teachings. They started organizing Buddhism. And when Buddha died the people who wrote his scriptures were all brahmins.