One who has the faith is a mu'min (believer).(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "iman" in a sentence
"One a so called iman representing Islam who will not give in to not building a recruiting station at the hallowed ground of ground zero where over 3,000 innocent America lives were blown to oblivion in just a matter of hours by 'radical' Islamic terrorists."
"Tidaklah mungkin dua manusia yang berbeda iman akan dapat membangun tali kasih sayang yang sejati."
"Sometimes is not easy, we think the patience has a limit … but the "iman" has not limit!"