A--- You knew earlier that belief comprises an utterance and deeds:

uttering of the heart and tongue, and deeds of the heart, tongue and organs.

The utterance of the heart is to affirm one's belief. And, the utterance of the tongue is to say the Two Testimonies. Deeds of the heart are intention and sincerity. Deeds of the organs cover all deeds of obedience.

So, if these four were gone -utterance of the heart and its deeds, utterance of the tongue and deeds of the organs -, belief in total is gone.

Moreover, if the conviction of the heart is gone, the rest becomes of no good. As, conviction of the heart is a precondition for their existence and effectiveness. This is like one who belied the Names and Attributes of Allah or any of what the Messengers were sent with or that which was revealed in the Books of Allah the Almighty. Moreover, in case Deeds of the heart alone were gone, scholars unanimously agree on that belief is gone too. As, believing without the existence of the deeds of the heart (intention and sincerity) is in vain. The same is applicable to Iblis (Satan), Fir'aun (Pharaoh) and his folks, the Jews and polytheists who saw the truthfulness of Prophet Muhammad (Peace be upon him) and confess it in public and secret, but used to say: He is not a liar, but we will neither follow, nor believe in him.