Well, certainly in my path I find it is more open to one's deeper spirituality than reciting prayers, possibly in a language one doesn't speak. First I would ask this person to ponder why these traditions don't relate or speak to him and then reflect upon what does relate to and speak to him. If he best connects to G-d through, say, nature, then what's to stop him from taking that path? As long as, in my view, one is not committing idolatry then whatever means one connects to G-d one can use. As this is a very personal dilemma, I do not want to say a lot as I do not want to play director or tyrant and speak about things I don't understand, and leave this really to you.