Conditions for the validity of Salaah

Performing salaah with impurity on one's body, clothing or salaah area

Q: Is someone who prays 5 times a day consistently with proper wudhu but knowingly and intentionally prays with impurity on the body, clothes or prayer area rejecting the obligation of purification, would this person be considered a disbeliever and be in hell forever? 

Is this person performing wudhu for each salah clearly showing that he is NOT rejecting the obligation of purification?

Shooting paintballs that have pig gelatine and performing salaah with paintball stains on one's clothing

Q: 

1. Is it permissible to shoot paintballs, now that there is evidence to show that the paintballs are made from swine?
Will the masala differ according to how much of pig gelatine is used in the paintball? 

2. Can a person perform salaah if he has these paintball stains on his clothes?