Did Father Flynn molest children in Doubt?

I was watching Doubt earlier, and other questions pertaining to this do not adequately answer whether it is true or not. I realize the movie is meant to sort of have an open ending, however, at the end I saw the blonde boy smiling because Father Flynn was leaving the school. Also, when you think about how he had long nails & flowers in his bible, I think that perhaps the movie was hinting that he was . I'm still very unsure (the movie is called Doubt), & unsure as to what Meryl Streep had doubts about. Her actions/thoughts on the matter (& all matters she was so certain of), or whether or not Flynn was a child molester. Perhaps Flynn became a priest because he was a ual, and took Donald (the black child) under his wing? It was hinted that Donald was a by his mother. Hm, well, I guess this is the point of the movie? To be in Doubt?