In his first Foundation novel, the Foundationeers created a bogus religion to subjugate the Anacreons, a gulliable and warlike people. The purpose was to incite a revolt and overthrow the government. The viewpoint was completely cynical, where the religion was used simply a means to a political end.
Humm, on second thought...
He was an atheist but I never saw anything from him in either his two-volume autobiography, nor his Treasury of Humor (in which he discussed a great number of topics and a lot about his own philosophies) that would indicate "nothing but contempt" for religion.
He even wrote the two-volume "Asimov's Guide to the Bible", in which I didn't see any "contempt" for religion either.
Now this starts to make since bin Laden was rich kid, quite westernize, educated and well read.
Not the type to become a throw back Islamic fundamentalist.
He in fact be a lot like Sadam, real not religious just power hungry and using Islamic fundamentalist as a tool.
But he didn't need to created a religion to subjugate the people, he already had one in place to hijack