There are conditions to be fulfilled on most things that nullify Islam! Things that are straight forward don’t require fulfillment of these conditions as in the case if he says that the Quran is changed or altered!

What if a Shia says something that nullifies Islam? Can we straightway put takfeer on him?

Apostasy | September 7, 2015 2:50 am
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Suppose a non Muslim wants to accept Islam but he is feeling worried about the penalty of apostasy. How should we explain this to him?
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Did a person commit kufr if he, in a moment of frustration, is about to utter something that is kufr, but he immediately realised what he was about to say and immediately refrained from saying it? He didn’t utter it but it almost came out of his mouth.