War in Heaven by Gavin Smith
There is a war in the digital realm. The nefarious military leader Rolleston has unleashed Demiurge, an ultra-powerful AI which seeks to control and consume everything else on humanity's computer networks, to guarantee himself ultimate power. A band of opponents and self-appointed freedom fighters, led (reluctantly and often shambolically) by ex-soldier Jakob Douglas, have fought back by unleashing their own AI onto the net to expose everyone's dark and dirty secrets, which has not gone down well with the great and the good who rule the Solar system. Of course, Jakob also had to go and call this AI 'God', utterly enraging the (very large) religious portion of the human race as well. Still, God has won the first round, banishing Demiurge, Rolleston and their followers to the colony systems. With Rolleston and his forces gathering strength in the colonies and preparing for a fresh assault on Earth, it falls to Jakob and his colleagues to pursue them and finish the job tha...