Interesting book review from Salon. Basically an author suggests that the persecution of Christians by the Roman Empire was exaggerated or non-existent save in a few brief periods (eg. Diocletion's persecution). May give it a read. In my reading of Roman history the persecution certainly was no more severe than the persecution of some other traditions and philosophies they didn't lile (eg. The Druids, Domitian's attack on the Stoics).

http://www.salon.com/2013/02/24/the_myth_of_persecution_early_christians...