DENVER - In between his two deadly shooting sprees, church gunman Matthew Murray apparently posted a furious threat on the Internet to kill Christians.

The warning - and other anguished, despair-filled messages over the past few months - were posted by someone using the screen name "nghtmrchld26." The postings paint a picture of a home-schooled Colorado youth once affiliated with the Youth With a Mission program - as 24-year-old Murray had been.

"I'm coming for EVERYONE soon and I WILL be armed to the (expletive) teeth and I WILL shoot to kill," Sunday's posting by nghtmrchld26 said.

"God, I can't wait till I can kill you people. Feel no remorse, no sense of shame, I don't care if I live or die in the shoot-out. All I want to do is kill and injure as many of you ... as I can especially Christians who are to blame for most of the problems in the world."

At least one visitor to the site was alarmed and contacted the FBI promptly, before the second attack, the site's administrator said. But the FBI would not immediately confirm that.

The online threats appear to include whole passages lifted from a manifesto written by Eric Harris, one of the teens who carried out the 1999 massacre at Columbine High School - 13 miles from Murray's hometown.

In the weeks before the shooting, nghtmrchld26 posted a number of messages about his own pain, despair and fury toward Christianity.

One post, called "My YWAM Horror Story," complained about being removed from the Arvada youth mission program.

"Why was I told that I couldn't be a missionary because I wasn't 'social enough'? I was told that I was 'an introvert,"' nghtmrchld26 wrote. "Everyone else got to go on their outreaches except for a few who lied about smoking (cigarettes). The authoritarianism and hypocrisy is outrageous." *