After washing to say the first prayer of the day, they pray again four more times and this is know as "salat". Its is the second most important of the five pillars of islam. They believe you have to do this because it is paramount to always remember why you are here. After the hustle and bustle of life activities and stress you suddenly remember to pray and reflect on why you're here.

It is a way of showing gratitude to Allah as they believe in no one else. This exercise cannot be over estimated. I mean someone who bathes five times a day can't be dirty. This is the same for a Muslim. When they pray, it softens their heart not to commit sin.

On the other hand, if they don't pray, it is in their belief that they will be punished. But today, i have a lot of Muslim friends who don't subscribe to the rules and regulations of being a Muslim. So i feel its all about their beliefs.