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I have not read that book by Asimov but I've read a bit of work by Erich Von Daniken which sounds along the same lines. Most famous of his works is probably "Chariots of the Gods" where he examines a lot of prehistoric evidence and draws not-so-loose conclusions from them, it's quite compelling, I believe there has been at least one documentary made from his work too, worth hunting down if you are interested in that kind of stuff...
As for the 'is there life' question, I don't believe you can deny it. Even if life is extremely "unlikely" requiring absolutely perfect conditions to 'happen' and exist, to think we are our Earth is the sole winners of some universal life lottery jackpot is crazy considering how many billions of stars we have just within out 'observable' surroundings. Wether we will ever be witness to other life is another question, the distances and times between them may just be insurmountable, but I can not believe that there is NO life anywhere else in the entire universe.
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