It seems to me it would be a poor sort of religion to put a spoke in his wheel by refusing to say you don't believe such harm of him as you've got no good reason to believe.
You might as well slander Fred: it comes pretty near to it when you refuse to say you didn't set a slander going.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "say you" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.