Imaan

Q: A few days ago, Salmaan Nadwi of India passed away. Some people were praising him, whereas he was a person who spoke ill of the Sahaabah (radhiyallahu ‘anhum) – especially Hazrat Muaawiyah (radhiyallahu ‘anhu). He made many derogatory statements about Hazrat Muaawiyah (radhiyallahu ‘anhu) and disgraced him. Is it permissible to praise this man seeing that he reviled the Sahaabah (radhiyallahu ‘anhum) and Hazrat Muaawiyah (radhiyallahu ‘anhu), and he showed them great disrespect until the end of his life?

Q: How can one develop complete taqwa and complete tawakkul? 

Q: If someone does kufr or shirk (but later makes tawbah and comes back), do they have to re-do all of the following? 

- previous valid zakat 

- previous valid fitrana+qurbani 

- previous valid prayers + fasts (what if they were in the middle of making up many years worth of qadas?) or can they ignore it and focus on the present and future acts they must do?

Q: Is making the masjid dirty and najis an act of kufr even if the person doing it has imaan in his heart, and loves Allah, the masjid and Islam?

Q: I want to know the difference between ilmul yaqeen, ainul yakeen and haqqul yakeen.

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: Can one take the sahadah alone without any witness?

Q: I came across the question regarding death and taqdeer. I am curious as to what is the situation when a person commits suicide. Would that person have passed away at that time either way?