Asserting the doctrines of a particular religion, or family of religions, requires denying other contrary doctrines?

Based on an assertion by Gary Gutting in the blog "THE STONE" The New York Times "The Case for ‘Soft Atheism’" May 15, 2014 http://opinionator.blogs.nytimes.com/201...

Does sincere interest, even allegiances, to more than one religion require resolution of major contradictions in doctrine?
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