Aqaaid

Utterances of kufr

Q: If a muslim attributes to himself an other religion by saying, for example, "I am a Jews" or "I am a Christian" or "the christian are better than muslim in aqida". Does such a person become a kafir even if he uttered the statement jokingly and even if he did not know that it is kufr to say such a thing?

Cursing Allah Ta'ala (Naudhubillah)

Q: I should not be saying this but it is bothering me. When something bad happens to me I lose my temper and say very very bad things about Allah Ta'ala like he is not merciful, he is cruel, and I also curse Allah (Naudhubillah). Do I become a Kafir on saying this? Are all my good deeds wasted by saying this? If I don't become a kafir, can I repent for these sayings?