You're Surprisingly Suited to Be a Heretical Practitioner!

This book solemnly promises that you can criticize the author, but please don't criticize me after you've criticized the author!

The protagonist is a transmigrator with a relatively open mind. He suffered some torment, which led him to become a heretical cultivator.

Although his style of doing things was somewhat extreme, at least he cleaned things up thoroughly, leaving no future troubles.