In Islam, believers serve God in many ways, including the following:
1- Helping other believers on God's Path
2- Conveying God's Guidance to those who want to understand it
3- Taking care of one's family, especialy parents, wife/husband, children
4- Having a positive active role in society, taking care of neighbors, the needy, orphans, ... etc
5- Contributing to establishing justice in society in all its forms (social justice through charity and volunteer work, economic & political justice)
6- Making this world a better place through work for raising living standards, advancing science & technology, protecting the environment, ... etc
7- Contributing to spreading peace and justice in the world among people