@shortstories If such a large group back in the day had such an oath, you would think there would be vast evidence of them killing people or something...

While indeed the jesuits were focused in stopping reformation, they tried to do it in the same way the protestants spread, through education. This angered protestants to no end, since they used to convert people to protestantism through their children, so they started to spread different accusations with no base in reality, like that one