First of all, we have to know what is the Definition of Beleif?

It is according to the Ahlus Sunnah "The Statement of the tongue, Belief in the heart, Actions with the limbs, it increases with good deeds and decreases with bad deeds"

So in order for the statement of the Shahaadah to be complete, we must justify it with our actions and our hearts.

Why are the hypocrites condemned to the depths of Jahannam? because even after they have testified beleif in Allah and His Messenger, and behaved as Muslims, they did not have beleif in their heart, therefore one of the conditions were lacking.

Sorry perhaps someone can complete answering your questions, I've got to run.