Does the nullification of deeds indicate disbelief?

Question:
Does the nullification of deeds indicate disbelief?

Answer:
It indicates disbelief; this is one of the evidences for declaring someone a disbeliever.
Q: Is the nullification of deeds due to abandoning the prayer or missing the prayer?
The Shaykh: Abandoning it entirely intentionally. As for if he missed it, he has suffered a great calamity. If he did not intentionally abandon it, whether due to sleep or forgetfulness and heedlessness, it is as if he had lost his family and his wealth, as if he had been struck in his wealth and his family.