No, it is a very normal thing to engage in, harmless, any health professional 'should' tell you that. And people shouldn't shame kids for it either, because that's basically where all these negative ideas that it's 'evil' and 'immoral' stem from, I think... In terms of religion, my favorite religion Buddhism has no mention of masturbation as anything. They list many accurate things under 'sexual misconduct' for example, but masturbation of itself, isn't an 'issue' anywhere. We need to relax on this subject overall.