Abolution (Wudu) in Islam is very important for prayer and reading Quran and so and so...
Because the Mosque or the place of worship is a sacred place, then Muslims should have Ablution in these places to worship or to read Quran, also Ablution is some thing Islam asked Muslims to have all the time if they can. In this haddith the prophet Mohammed (peace be upon him) said when you are in the mosque praying or worshiping it's good to have Ablution because the angels ask Allah forgiveness and blessing for you, In the other hand if you don't they don't but it is not forbidden to not have it inside the mosque specially.
There are people out there that actually have a problem with flatulence...They would spend their whole day trying to get pure!... NO
If some one has that problem Islam is very easy and suggest from that person to do it ones a day or just before every prayer … it’s simple and easy …