What is the ruling on making an exception in faith?

Question : He asks: What is the ruling on making an exception in faith?

Answer : Making an exception in faith falls into three categories: disbelief, obligatory, and permissible. If a person says, "I am a believer, if Allah wills," and by this he means that he is hesitating—meaning he is hesitant if Allah wills—then this is disbelief, because faith requires certainty. If he says "if Allah wills" meaning that he believes by the will of Allah, that he believes by the will of Allah, then this is true and there is nothing wrong with it.
If someone were to ask how it is valid to say “if Allah wills” regarding a matter that has already occurred, we say: just as Allah (Glorified and Exalted is He) said: even though they will certainly enter it. And as in the Muslim’s saying over the graves, “Indeed, if Allah wills, we will be with you,” meaning that our joining you will be by the will of Allah. This is the truth. Accordingly, the qualification here is explanatory, meaning that my faith was by the will of Allah. As for the obligation, it applies if one fears arrogance regarding himself, thinking that he attained faith by his own power and strength. In that case, he must say “if Allah wills” to refute this defective meaning. Do you understand? Accordingly, the one who intends to disclaim credit by saying “Yes, if Allah wills,” his exception is permissible.