Renewing one's imaan
Q: If you see a Muslim doing kufr by mocking Islam as an example or doing something else that is kufr, then he later does the 2nd kalima, perhaps for wudhu, but then gets informed that what they did in the past was kufr, is it fine if they just repent without doing the 2nd kalima again? If they don't, are they considered as disbelievers?