I would. Mrs Denny was a liar. And truthorfiction.com are just trying to "wardrobe malfunction" this.
You can think whatever you want of Mrs Denny. She did report being an eyewitness to Darwin's conversion. Given that none of Darwin's family substantiates his conversion, I don't think Hal should have used it. But it is possible Darwin converted, it's also possible he told Mrs Denny what she wanted to hear, which would explain why Darwin never said anything to his family. Hal didn't lie in quoting Mrs Denny any more than Bush lied when he quoted the British intellegence. Mrs Denny and the British intelligence did say what they said. That we can't independently substantiate it does not mean it wasn't true.