Abyss was the base camp of primeval energy that formed each and every world. Those were completely chaotic lands. Even though they were brought under control by Sui Xiong, even if Sui Xiong bestowed order upon the land, he wouldn't be able to change its nature.
If he couldn't resolve the issue, even if he forced the place to become a holy kingdom, after the believers' souls entered they would only turn into devils.
Sui Xiong believed that among his believers, maybe there were some psychopaths, but this 'maybe' would probably be superfluous. Maybe there were crazy people but his 'maybe' seemed to be superfluous. Maybe there were utilitarians but his 'maybe' might still be superfluous. But, regardless of psychopaths, crazy people or utilitarians, they still wouldn't want to become devils.