Gordon Klingenschmitt is a former navy chaplain (removed by the Pentagon, but refuses to admit to having being thrown out), occasional columnist for WorldNetDaily, and vehemently insane. He is fanatically anti-gay and a fan of imprecatory prayer. He applied it, for instance, against Mikey Weinstein, leader of the Military Religious Freedom Foundation, and Barry Lynn of Americans United for Separation of Church and State. The tone is fascinatingly old Testament: “Let their days be few, and replace them with Godly people. Plunder their fields, and seize their assets. Cut off their descendants, and remember their sins, in Jesus' name. Amen” (his second attempt is discussed here). Charming fellow, in other words.
Klingenschmitt is in fact a champion of religious freedom, but only if it is understood his way – i.e. as observing God’s first commandment. I am not sure he is a liar for Jesus as much as an ignorant moron and willful misunderstander for Jesus. He is, unsurprisingly, also a DeMar style revisionist and theocrat.
Klingenschmitt may have been thrown out of the military (as was Jim Ammerman), but people like James Linzey remain. And that is indeed cause for concern.
Diagnosis: Batshit crazy raging fundamentalist and nutjob (and Liar for Jesus). Probably too insane to be any real danger, but one never knows.