Impurity on body, clothes or place of Salaah

Q: If a person performs salaah on a pure musallah but their feet touch a place which has dry impurity when going into sujood during salaah, is the salaah valid?

Q: Let’s say someone does wudu for each salah but intentionally prays with impurity on his body. Is him doing wudu for each salah a clear indication that he’s NOT rejecting the obligation of removing impurity on the body before salah?

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?

Q: Given the spread and propagation of Interfaith and the Abrahamic Religion, what is the shar'i ruling on performing Salaah in a multi-faith prayer room? 

Multi-faith prayer rooms are now found at airports, petrol stations, malls, offices etc. Some multi-faith prayer rooms have the symbols for each religion, at together, displayed on the wall or door.

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?

Q: If I place a pure prayer mat on an impure carpet and pray on it but while making sujood the edges of my long jilbab touch the carpet, will my salah be valid?

Q: I prayed salah from puberty with proper wudhu but without ghusl for 7 years because I was not aware of the masalah of ghusl. Should I reperform those salahs?

Q: If blood splashes on my clothes while slaughtering, can I perform my salaah with that clothes? Does the blood have to be a certain amount for it to be impermissible to be read with? What if it was just small dots of blood that splashed on my clothes? If I read salaah with the clothes, is my salaah jaaiz?

Q: Is a ladies salaah valid if performed with her baby tied to her back, due to safety reasons when performing salah in a crowded place?

Q: My wife is expecting and colostrum/milk began expelling. I would like to know the following rulings:

1. If the clothing becomes soiled with a few drops, can salaah be performed?

2. After birth, if the clothing becomes soiled with actual breastmilk, can salaah then be performed?