I also found this, reported in today's Telegraph, and if it is accurate, then he is most definitely religious. He may also be the same Scott Roeder who, as a member of the Freemen, an anti-federalist Christian militia group, was jailed for 16 months in Kansas in 1997.
It seems George Teller was killed because his clinic carries out late term abortions - after 21 weeks - when many babies would be capable of being born alive. According to the 20 Weeks Campaign statistics, in top neonatal units 80% of babies born at 24 weeks, and 66% born at 23 weeks, will survive, so I'd say at this stage, there's no doubt that these babies can be considered 'a life' - even if they aren't born. Having said that, I wouldn't in any way condone this murder, and in actual fact I had the same thought as Ankou. If these people believe that murder is wrong, how can the perpetrator of this crime justify his actions? I can only presume he feels that by killing George Teller, he is saving the lives of countless unborn children.