Cable works no differently although the modem and router are separate devices. The OP's problem is his access point is not a router. Your ADSL modem probably has a router in it as well (most do).
This is not complicated. He's just using the wrong box to share the Internet connection. He could use the AP he has to extend the range of his network though once he has it working or use it to connect a non-wireless device to his wireless network.
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