Are We Human Made in the image of GOD?

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This is something which suprises me a lot. Iam a christian by religion. It was clearly Stated inthe Bible that GOD created us in his own image. If So, Why are some people born deaf,dumb,blind and physically challenged? Isnt it very unfair for those people, thier faith can be challenged when they look at themselves? Do commit blunder as well when he created us? If not why so much difference in the way each of us are created,