Question(29):

But what is the Islamic Ruling vis-à-vis the unattestation to the increase and decrease of faith?

Answer:

The ruling is based upon the status of the person who disapproves of the attestation. If he did so out of rejection and denial, then he is a Kaafir because of his denial and  rejection of what the Qur’aan has stated.

And if his disapproval is due to ta’weel (interpretation), then it may or may not lead to disbelief, for ta’weel is of different levels. So, a person who says, based upon his interpretation, “I don’t attest that Eemaan increases and decreases,” then he is, with respect to Eemaan, in a state depending upon his level of interpretation.