The nuttiest thing to me about dispensationalism is how they take the New Jerusalem in Revelation 21 as literal—a literal city floating above the earth, 1500 miles square, with one street. If this stuff were not being taught in Christian churches, it would be considered completely cultic (or science fiction).
Yeah sure is nutty to take the Word of God literally! /s
And he nuttiest thing to me about preterism is how they see the resurrection as being past, and that most all (or all) in the book of Revelation as being fulfilled, thus rendering the devil to be bound, that he should deceive the nations no more, and that the sound of musicians, shall be found any more in Babylon, etc.
Then there is your vorticy ("the timeline of the resurrection was not the last day of time, but the last day of the Old Covenant Age!") trying to escape being in the company of those whose "word will eat as doth a canker: of whom is Hymenaeus and Philetus Who concerning the truth have erred, saying that the resurrection is past already; and overthrow the faith of some." (2 Timothy 2:17-18)
But which is secondary to your own particular heresy warning about "the doctrine and the consequences of adhering to it. When the Trinity is added to the Gospel, the ultimate conclusion is to believe that it is impossible to be without sin in this lifetime." http://hubpages.com/religion-philosophy/The-Grave-Error-of-Christianity-the-Trinity-Doctrine-Part-2
I am not into future prophecy much, though I do not subscribe to the pretrib rapture belief, seeing it more warranted that the Lord keeping the faithful through the Tribulation, to meet the Lord in the air at the resurrection and go with him to the battle of Armageddon, and stand at the judgment seat of Christ, and reign with Him for a 1,000 years, and site in judgment at final judgment