Kufr

Using guesswork and speculation in one's life

Q: Is guesswork and speculation considered kufr if one doesn't claim knowledge of the unseen? 

Examples: 

1. A call comes to the phone, I haven't looked at it, and I speculate it's surely x person with very much confidence and it turns out to be them. And I say "look I knew it"(meaning I am so smart that I guessed it correctly not claiming knowing unseen). 

2. In multiple choice type questions choosing any of the answers blindly. Hoping you'd be correct. You don't know the correct answer and you choosing the answer was blind. Like betting. 

3. Someone asks you to guess what's in their hand and you guess. 

4. Saying a particular fictional story would probably end like the person is expecting. 

In short, is speculation and guesswork in which you have strong confidence that you are right and the one in which you don't have it. Is it considered kufr?

Making statements like "I will challenge Allah Ta'ala"

Q: I would like to bring a matter under consideration regarding my husband, as he said that "he will challenge Allah". 

It all happened when I told him that I want to take separation from him and I mentioned that Allah has given me this right, to which he said no I can't and first he said I can bring any Ulamas I want he will send them all flying, they cannot interfere, I will challenge them all, to which I said okay no problem but Allah has given me this right. It's almost 10 years you can't look after me so I will go away myself and then he said "I will challenge Allah ". Listening to this I told him are you gone nuts what are you talking, you can't talk like this. He stood firm on his statement and after that I kept myself quiet, before he says something more bad. 

Just to mention, he was in his full senses, wasn't angry when the topic started. I keep Ulamas away as he has no respect, but please I want to know what to be done with this statement. 

Also his ibadaat is personal, I don't want to bring that in the picture, but want to mention he used to read fajar at the time of sunrise, which always caused a spark between us. He never use to listen. Now he no more reads, even on big nights and on Shabe Barah he told my son Asar time that books are already closed we don't need to make ibadat. I was completely shocked and explained to my son that we have to make ibadah till fajar. So I'm not sure what is his say in religious matters. 

Please I want to know what is the way forward with it.