Does the Hadith of the Card invalidate the aspect of action, and are the two testimonies sufficient for salvation from Hellfire, even with the commission of grave sins?

The Hadith of the Scroll (Hadith al-Bitaqa) poses a challenge for those who interpret it literally, as merely uttering the declaration of monotheism (Tawhid) is not sufficient for salvation from Hellfire. Rather, it requires understanding its meaning, believing in its content, and acting upon its implications. Hypocrites say it with their tongues, yet they will be in the lowest depths of Hellfire. Allah the Almighty says: (And they say, "We have believed in Allah and in the Messenger and we have obeyed"; then a party of them turn away after that. And those are not [actually] believers).

The word of Tawhid benefits its pronouncer if said with sincerity and devotion. The person in the Hadith of the Scroll possessed complete sincerity and certainty. Tawhid necessitates love for Allah, submission to Him, and obedience to His commands, which prevents its owner from committing sins and persisting in them. Believing in it with truthfulness and certainty necessitates that Allah be more beloved to him than anything else, and more feared by him than anything else, so that no desire remains in his heart for what Allah has forbidden. This is the one whom Hellfire is forbidden to, even if he has committed sins.