If enlightenment is something that one achieves by ones own power and intellegence, as in the Western intellectual tradition, then perhaps not. In the Buddhist traditions in general this is less clear, but in Zen Buddhism this is clearly not the case, for in that tradition thought itself is a trap that holds one in the delusions of samsara. But Zen Buddism does derive from the basic ideas of Buddhism in the Pali canon which sees the belief in an individual self as one of the fetters that must be escaped from to reach enlightenment.
If Christian thought were to find any common ground here it would be that salvation does not come by ones own effort but rather by a letting go found in delivering oneself into the hands of God. I think both Buddhist and Christian traditions will see human desires as a trap and delusion of sorts, and much of what the Bhuddist calls samara, Christianity would call fleshly -- an attachment to the physical aspects of life. So the Bible says that flesh and blood cannot inherit the kingdom of God. So I think that there is much reason in both traditions to suspect that both the handicapped and the child both would find it more easy to let go of the delusions of this world and to accept being embraced by the divine. Perhaps it is the insistence on achievement and being in control that that ties us to samsara and the flesh more than anything.
Yet I personally cannot embrace a philosophy that is antagonistic to creative achievement. As a scientist I see the nature of life itself as being all about creative achievement, and as a Christian I see in creative acheivement as part of the image of God within us. There is in the work of the artist (of every kind) an abandonment of self in a devotion to the creative act. So I guess that even for the artist, there is the question of whether it is about the art or about the artist. If the artist wields his talent as a means of self-aggrandizement then I suggest that he has become like the unconscious plasma of the sun and water vapor in atmosphere that helplessly creates visions of beauty that can transport others to an awareness of the divine even if it is not capable of doing so themselves. And some of those so transported, may be the child or the handicapped who in their inability is transported out of delusion by this art even as the ability of that sort of artist becomes just one of the bars of the prison that traps him within it, because of the way he uses it.