Finished this finally. Took a long time. It's just the style I don't really like. It gets better towards the end, when you start to grasp what's going on with the characters.
Also, Mr. DeLillo, I don't think the first line in the Qur'an is "This book is not to be doubted."
I'm pretty sure it's "In the name of the Lord, the Most Gracious, the Most Merciful".