Yes. You can have a deep personal faith in God even if you don't belong to a church or follow an organized religion. You can also deepen your understanding of God by visiting a variety of churches and reading the Bible, or other Holy books if you want to learn more about religion.
the question then would be, what God are you believing in? Can you be a pro ball player without getting on a team and going to practice? I guess you could believe you are and call it something like sportialilty. try a non denominational bible teaching church. Religion is Man's attempt to reach God. Jesus is God's attempt at reaching man.
The Simple Definition of Religion Basically Is Personal Belief. Therefore, Your Choice Of Personal God Is Y o u r Religious Decision and B e l i e f System ><> Definition: religion[ ri-lij-uhn ] noun 1. a set of beliefs concerning the cause, nature, and purpose of the universe, especially when considered as the creation of a superhuman agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs. 2. a specific fundamental set of beliefs and practices generally agreed upon by a number of persons or sects: the Christian religion; the Buddhist religion.