The Templer Order was forbidden, also because they spit on the cross and even, if the Inquisitor knew that spit was disinfectors helping to clean a jewellery cross it was on the bottom line the superior knowledge and mysticism of the Templers that caused their trial against them.
It is 7 sins of death, yet 6 is the number of the devil and 7 since pretty much ever the lucky number. So, which of the seven sins is the one turning you lucky against the others, knowledge fundamental for a knight about to go into darkness where sins of death rule.