The head of conservative group American Family Association (AFA) has said that President Obama can't be a Christian because he supports gay marriage.

Speaking on his radio show last Friday, Bryan Fischer said: "I do not know what goes on inside Barack Obama's heart, but I do know that he is not a sincerely devoted follower of Jesus Christ. So, in my mind, that means he's not a Christian.

"Nobody can support and promote and celebrate homosexual behaviour who is a sincerely devoted follower of Christ. It's impossible, because Christ and his apostles made it very clear that's a sin."

Fischer went further still; suggesting that Obama is actually a follower of Islam."He walks like a Muslim. He talks like a Muslim. He sounds like a Muslim. He acts like a Muslim," he said.

"Jesus said 'by your fruits, you shall know them' and at some point people are going to start connecting those dots."

Fischer has condemned Obama's stance on gay rights in the past. Following the President's second inaugural address, in which he said that gay people should be "treated like anyone else under the law", Fischer responded: "Homosexuals do not have a constitutional right to engage in sodomy".

"It's absurd in the extreme, it's ridiculous, it's ludicrous for homosexuals to claim that they have some kind of constitutional right to engage in sexually deviant behaviour," the now 63-year-old added.

"All men are created equal, but nobody, nobody, nobody is born gay".

The AFA is often described as a hate group, and has campaigned extensively against gay marriage. An LGBT rights campaign in Mississippi last year prompted the organisation to release a statement condemning what they called "a war against the Bible in America".

Though his personal faith has been the subject of much scrutiny, Obama has expressly aligned himself with Christianity. In an interview with Christianity Today before his Presidential win in 2008, he said: "I am a Christian, and I am a devout Christian. I believe in the redemptive death and resurrection of Jesus Christ.

"I believe that that faith gives me a path to be cleansed of sin and have eternal life," he continued. "But most importantly, I believe in the example that Jesus set by feeding the hungry and healing the sick and always prioritizing the least of these over the powerful.

"I didn't 'fall out in church' as they say, but there was a very strong awakening in me of the importance of these issues in my life. I didn't want to walk alone on this journey. Accepting Jesus Christ in my life has been a powerful guide for my conduct and my values and my ideals."