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Becky, the AG.org website has links to their position papers, including one on disabilities. It's immensely condescending and heavily reliant on faith healing, but more humane than the position you're concerned about. In essence: sometimes God gives you a disability so that he can show his power through healing it, and sometimes he wants to teach you a lesson by letting you live with it - either way, the church and its people are instructed to be nice and compassionate. (In contrast, look at their position paper on homosexuality - absolutely horrible.)