Muslims (people who practice the Islamic faith) believe in the same God as Jews and Christians do. Muslims pray five times a day towards Mecca, their holy city, and they normally pray in a mosque, like Christians would pray in a church or Jews would pray in a synagogue. They believe in love and goodness.
Muslims believe in the Five Pillars: the proclamation "There is no god but God, and Mohammed is his prophet"; prayers five times a day; the giving of alms (money, clothes, food, etc to the poor); keeping to the fast of Ramadan; and hajj, which is making a trip to Mecca at least once in their lifetime, if that is possible.
Muslims have holidays like Ramadan because it is really hard to fast and go to work at the same time.