Definition of believer | Bee Dictionary of English

I'm a big believer that when opportunity presents itself, you've got to seize it.
I'm a big believer in geographic determinism, and I suspect the clement weather in San Francisco has a lot to do with its pervading buoyant mood.
He even says he might vote Republican for President in 2008, a not-so-veiled hint that he would prefer John McCain, his fellow true believer in the Iraq war, to most, perhaps all .

Former Iranian hostage hopeful of progress on compensation
Although she was held hostage by Iranian revolutionaries for 444 days, Kathryn Koob has been a firm believer in forgiveness and reconciliation.
June 18, 2013 - The Gazette
Feingold: Good ol' common sense
Although facts are very important in the practice of medicine, there is a still an important role for the use of good old common sense. I am a firm believer in peer reviewed scientific studies but I realize they are not infallible. However, they still remain the best way to determine the cause or treatment of a specific disease.
June 18, 2013 - The MetroWest Daily News
Sundance Selects Acquires Hilla Medalia's Dance Documentary 'Dancing in Jaffa'
Sundance Selects has acquired North American rights to Hilla Medalia's documentary "Dancing in Jaffa," which premiered at the Tribeca Film Festival. The film follows ballroom dancer Pierre Dulaine as he returns to his hometown Jaffa, Israel expecting his old home but greeted by new racial animosity. A firm believer that dance can build self-esteem and social awareness, Dulaine brings his popular ...
June 18, 2013 - indieWIRE

Barack Obama in Afrik.com
I am a strong believer in civility and in a bipartisan foreign policy but that cause is not served with dishonest, divisive attacks of the sort we have seen from George Bush and John McCain over the last couple of days,said Mr Obama yesterday.
John McCain in Kansas City Star
He has apologized,McCain said. "He said that he is deeply sorry. I'm a great believer in redemption. Whether he needs to do more in order to satisfy the concerns of people like the members of that team, that's something that's between him...