So who is a "real Christian" and who is a "real Muslim"?

[Nye Bevan]

9. McVeigh never claimed any religious motivation for the OK bombing.

McVeigh claimed that the bombing was revenge for "what the U.S. government did at Waco and Ruby Ridge."[101] McVeigh visited Waco during the standoff. While there, he was interviewed by student reporter Michelle Rauch, a senior journalism major at SMU who was writing for the school paper. McVeigh expressed his objections over what was happening there.[89][102]

McVeigh frequently quoted and alluded to the novel The Turner Diaries; while rejecting the book's racism,[36][51] he claimed to appreciate its interest in firearms. Photocopies of pages sixty-one and sixty-two of The Turner Diaries were found in an envelope inside McVeigh's car. These pages depicted a fictitious mortar attack upon the U.S. Capitol in Washington.[103]

In a 1,200-word essay[104] dated March 1998, from the federal maximum-security prison at Florence, Colorado, McVeigh claimed that the terrorist bombing was "morally equivalent" to U.S. military actions against Iraq and other foreign lands. The handwritten essay, submitted to and published by the alternative national news magazine Media Bypass, was distributed worldwide by The Associated Press on May 29, 1998. This was written in the midst of the 1998 Iraq disarmament crisis.

http://en.wikipedia.org/wiki/Timothy_McVeigh

So I'm really not sure where you get "claim divine inspiration for their acts" from.