Aqaaid

Q: Is there a difference between a Shia and a Salafi? 

The Shias have no respect for Sahaabah (radhiyallahu anhum) and the Salafis have incorrect beliefs with regards to Allah. Hence both do not have proper Aqaaid. 

Q: Is it permissible to celebrate Thanksgiving?

Q: I would like to ask if it is permissible to read comics online which are pictured books online with no inappropriate content. The genres are:

1- Supernatural 
2- Clean romance (no sex) 
3- Time travel 
4- Fiancés/husband /wife or boyfriend/girlfriend 
5- Superpowers etc. 

I will read all these only when I am menstruating or have nothing to do.

Q: Is it permissible for a Muslim business owner to give his staff Christmas/new year bonuses?

Q: Can a Muslim go out to view the new year's fireworks? Even if it be standing by his room window and watching the fireworks?

Q: 

1. Is it permissible for a Muslim business owner to promote his business using adverts with Christmas decorations? 

2. Can a Muslim businessman sell Christmas lights, trees, decorations, etc.? 

3. What is the ruling regarding a person decorating his business with Christmas lights, Santa Clause etc.?

Q: I have recently reverted to Islam while facing a terminal disease from which I might die in some months. I believe my terminal disease is a punishment due to my sins. 

Is my shahada still accepted despite me knowing I will die?

Q: Does calling Shias "Kaffir" make yourself a "Kaffir" since we can't make takfir of our own Muslim mumin brothers, is this correct?

Q: What will happen if a person commits kufr but later forgets about it? 

Secondly, if you get bad thoughts about Allah Ta'ala and you feel the sensestion of happiness about it but you know thats bad, is this kufr too?

Q: If a Muslim commits an act of kufr like mocking Allah Ta'ala, will saying the shahada be enough for him to become a Muslim again or is repentance mandatory. If he just says the shahada, will he become a Muslim even if he doesn't repent?