You should try "Age of Zeus" by James Lovegrove. Here's a little write-up about it: "The Olympians appeared a decade ago, living incarnations of the Ancient Greek gods on a mission to bring permanent order and stability to the world. Resistance has proved futile, and now humankind is under the jackboot of divine oppression. Then former London police officer Sam Akehurst receives an invitation too tempting to turn down, the chance to join a small band of geurilla rebels armed with high-tech weapons and battlesuits. Calling themselves the Titans, they square off against the Olympians and their ferocious mythological monsters in a war of attrition which not all of them will survive!"