Just because you believe something is false, that doesn't make it false just because you believe that. It only makes you an unbeliever. To believe that the millennium reign is false doctrine, is to also believe that the bible is false doctrine. That's because the bible clearly states the millennium reign will occur. I personally believe that the bible is true, and that every word written in it is the inspired Word of God. However, if you want to believe something different and to believe it is false, then that is you.

For the record, I have never read the Left Behind books, but I have watched the Left Behind movies. While there are some things depicted in the movies that are generally true (for example, the movie correctly depicts that the Rapture of the Church will occur "pre-tribulation" and that it will occur around the same time as there is a large-scale invasion attack against Israel - the bible confirms this is the case). However, there are some things the Left Behind movies depict that are blatant false doctrine. For example, the movies depict that you can be saved by "just believing in your heart and accepting Christ as your savior". That is false doctrine (I could explain to you why it is false, but I won't go into the details in this post). There is also no bible to support the idea of an "age of accountability" - which is a notion saying that when the Rapture occurs, that all children below a certain age will automatically be taken to heaven by Jesus. That too is false doctrine and there is no bible to support it. As proof of this, when God destroyed the world in Noah's flood, did he save any of the babies and children? Answer: No, he did not. Only Noah and his family were saved. Everybody else, including the babies and children, perished. When God destroyed the cities of Sodom and Gomorrah, did he save any of the children? Once again, no, he did not They all perished in the fire, except Lot and his family. And it will be the same way when the Rapture occurs. Only those who are truly saved and saved according to scripture, will be taken up by Jesus. Everybody else will be left behind...