Getting involved in interest

Q: My dad bought a phone on a credit card. If the bill is payed within 54 days then no interest is charged. However my dad couldn't pay the money within that time so now the total bill is 95 rials whereas the phone's price was 85 rial. Now we want to get rid of this card but we have to pay the bill to finish off the sunscription. So please guide us.

Rejecting a fardh of Deen

Q: I want to ask about the reasons which cause the loss of a person's Imaan. There is a man who does not fast in the Holy month of Ramadaan. He does not say prayers regularly. But whenever he says the prayer, he only recites "Ashadu Allah Ilaaha Illallah" in attahiyyaat and ends the prayer. He does not recite complete kalima and Durood etc. He gives the reason that he does so because he does not like reciting anyone elses name in Namaaz except ALLAH. He also does not believe in Qurbaani and says it is better to give money to a poor person than spending money on this event. Whenever something is explained to him-in the light of Sunnah/Hadees, he does not agree/believe and says just tell me where this thing is written in the Quran. About Hajj he once said it is just a way to increase the treasures of the Arabs. My question is that can this person be regarded as a Muslim and if he marries a Muslim woman, will the Nikah be vaild?

Doubts regarding one's fast breaking

Q: I'm making up my kaffarah fast (60 consecutively)

1. I was sweating, sweat dried and I licked my lips and swallowed it, did my fast break.

2. I have dry lips, my skin comes of, I licked my lips and the skin went into my mouth, I swallowed it, tried to remove it before doing so but couldn't feel it in my mouth, is my fast broken?

3. This is the second time I have started my kaffarah from scratch, my fasts keep breaking for stupid reasons like this, what can I do?

Paying interest on one's credit card

Q: A month ago my dad bought a phone on credit card. And if we pay the money used within 54 days then no interest charged. However my dad couldn't pay and now the time period is over for no interest. So now next Friday according to him he will pay. But now is there any way of avoiding interest. He only bought a phone he uses and nothing else. Please help us out and tell us how can we get rid of this card.