The evangelist, who is urging people to write in the name of Jesus instead of selecting either candidate on Election Day, refers to the Rev. Billy Graham's recent remarks on Romney, which many say is an unofficial endorsement of the GOP candidate.
Earlier this month, Romney met with 93-year-old Graham at his home in North Carolina, where the evangelist praised the Mormon politician for his "values and strong moral convictions."
"I will turn 94 the day after the upcoming election, and I believe America is at a crossroads. I hope millions of Americans will join me in praying for our nation and to vote for candidates who will support the biblical definition of marriage, protect the sanctity of life and defend our religious freedoms," Graham added.
An article which calls Mormonism a "cult" was removed from the Billy Graham Evangelistic Association's (BGEA) website following the Republican's visit, with Chief of Staff Ken Barun explaining that the reason behind the decision was that BGEA did not wish to be a part of the debate on Romney's faith, which has reached great heights this political season.
Other notable evangelicals, like Pastor Robert Jeffress of First Baptist Church in Dallas, who first said that Mormonism is a cult and Christians should not be supporting it, later changed his stance and endorsed Romney, calling him the "lesser of two evils" – although he maintains that Mormonism is not Christianity.
Keller told CP that he finds Graham's decision to praise Romney and to remove the warnings against the Mormon Church as "sad."
"To not just endorse a 5th generation high priest of a satanic cult that propagates a false gospel leading souls to hell, but than remove the warning from his website that Mormons are NOT Christians in order to justify that endorsement is a sad moment," he added.
Keller has been vocal against Mormonism and a potential Romney presidency, and once again stated that the religion cannot be considered a part of mainstream Christianity.
"(Two hundred) years ago the Christian church in the day of Joseph Smith, the founder of Romney's cult, ran him out of every town he tried to spread his false beliefs for preaching heresy. The majority of the Christian church today is so watered down, Biblically illiterate, and compromised, it is actually supporting a man whose entire life has been controlled by that same satanically inspired heresy!" he said.
The Internet evangelist made it clear, however, that his warnings against Romney and the LDS Church does not mean that he is endorsing President Obama.
"I was one of the first in the media in 2007 to warn people who then, Senator Obama was, and shared that if he was elected President in 2008 it would be a form of God's judgment on this nation for our sins," Keller claimed in a recent press release. "According to the Book of James, Chapter 4 Verse 4, President Obama is an enemy of God in every sense of the word. As I warned and has come to pass, he has been the most pro-abortion, pro-homosexual, pro-enemy of Israel President in history. President Obama opposes God on every major spiritual issue of the day."
In the same press release Keller again outlines how Mormonism has spread in America, why it is a dangerous "cult" and why its adherents do not believe in the same God or the same Jesus as Christians. He also encourages the media to challenge Romney on what he sees as lies spread by the LDS Church in order to convince more people to join their ranks.
The Internet evangelist's Vote for Jesus website currently has over 1.3 million people who have signed up to write in Christ's name on the ballot come Nov. 6.
