Aqaaid

Do any of the following statements and actions constitute kufr?

Q: Do any of the following statements and actions constitute kufr:

1. One's mother walks into the room to pray, and you tell her to go pray somewhere else (or go pray in another room) because you're watching something on your computer.

2. Committing sinful acts (like watching pornography, masturbation, listening to music) in the same room where the Holy Qur'an is kept, and other Islamic books and literature is kept (like books of Durood Shareef).

3. Someone says that the Old Testament is barbaric and harsh, and one nods and smiles in agreement.

Discarding or burning papers that contain the name of Allah Ta'ala, etc.

Q:

1. How should we discard the papers/school books/note books having words written like Allah, Allah's names or ayahs etc.?

2. Which words need to be given respect and removed from before throwing away the books? Are the words Quran, Rasool, Nabi, Muhammad or any Surah's name to be discarded with respect?

3. If we burn them, can the ash be thrown anywhere?

Not following a mazhab

Q: People in my area follow different imams and they claim that their act is correct and perfect than the other. They also say to me that you follow one imam only, reply to them that I will follow what is there is in Quran and sunnah (hadith-sahih + sanan+ other books-with references) irrespective of following one imam and making sects (as said in Quran" Vo ati ullaha Vo ati ur rasula") and they don't fluctuate w.r.t time as it is followed by prophet in times. Am I correct in this case of following Quran and hadith(also includes imams +sahaba+mufti+fuqaha) or following a single imam?

Being careful in one's speech

Q: A 15-year-old adult girl was misbehaving with her mother. The mother said to her (in Urdu), “Allah Ta'ala is watching you”. The daughter replied in a sarcastic tone (in Urdu), “Well! Allah Ta'ala is watching me! (Urdu: Acha! Allah mian mujhey daikh rahay hain!). Then the mother said (in Urdu): “Allah Ta'ala is listening”. The daughter replied again in a sarcastic tone (in Urdu): “Well! Allah Ta'ala is listening to me! (Urdu: Acha! Allah mian sun rahay hain!). The question is: is the ‘eman of this girl valid after saying these sentences? If the 'eman is invalid after saying these sentences, what is she supposed to do to revive her ‘eman? What about her salats, fardh Hajj, fardh fasting, etc.?

People congratulating one on one's birthday

Q: Before I had an idea about not celebrating birthdays, but on my first birthday in university, I gave a treat thinking that to feed someone is good, but I don't know if it's correct or wrong! Now, my second birthday is about to come and I don't know what to do if they greet me on my birthday, Alhamdulillah this year it's Sunday (I'll be on leave) but what reply must I give to the messages and phone calls from people who greet me (as I don't want to celebrate/give a treat in the name of a birthday), could you please tell me?