Muslims believe in Jesus as a prophet, but not that he is the son of God. Mormons do believe that Jesus is the son of God, which is the defining characteristic of being Christian
He can't "cure ADHD" because it is a symptom of many different things. He has to diagnose the patient and determine the underlying cause. He gave a list of potential causes that included vision problems, iron deficiency, and sleep problems. I imagine each of these have their own cure which in turn fixes the symptoms of ADHD. You are implying that ADHD only has a single cause, the author is disagreeing with you.
He isn't denying that ADHD doesn't exist but instead he is saying that it exists as a symptom of other ailments. His title is a bit inflammatory, but that doesn't disprove his argument. The article is much better than you are giving it credit for.
Could someone give me a brief overview of the what the code is doing? I see a bunch of "on ____" blocks, which I thought might be functions but then they don't seemed to be called later on (unless I am missing something). What language is this?