I'd go with sincere but misguided and that's based on only a few minutes look into who he is and what he's all about so the assessment may change.
To get you all more familiar with the controversy (in regard to Islam) here are some things he has said:
"I want them to know that they don't have to die in a car bomb, don't have to die in some kind of holy war to be accepted by God. But it's through faith in Jesus Christ and Christ alone,"
"I love the people of Islam but their religion, I do not agree with their religion at all. And if you look at what the religion does just to women, women alone, it is just horrid. And so yes, I speak out for women. I speak out for people that live under Islam, that are enslaved by Islam and I want them to know that they can be free," he said.and after 9/11 he said that Islam was
'a very evil and wicked religion.'Source 
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