Is it permissible to alert people to the errors and transgressions found on the website "submission.org", which include slandering the Sunnah and claiming that some verses of the Quran are not the word of God, and what is the opinion regarding the website's discussion of the numerical miracles in the Quran?

If you become certain of the existence of Sharia violations on a particular website, it is legislated for you to clarify them to people and warn them against entering the site; because warning a person about a dubious matter before they encounter it is more beneficial. This is not considered drawing attention to the site. As for websites that contain Sharia prohibitions, the stance is to advise them and warn Muslims about their violations as much as possible. The topic of the numerical miracles in the Quran has been previously discussed in earlier fatwas.