Do you think the 144,000 is literally 144,000 ethnic Jews that are virgins and have never lied? Seriously? ...never lied?
What's actually impossible is claiming the verse says they have never lied. It doesn't say what you claim it says. Amill has a serious problem in refusing to accept exact numbers. Amill changes numbers in Revelation which violates these warnings:
Rev 22:18 For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book:
Rev 22:19 And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book.
Changing a thousand years into thousands of years and changing 144,00 into a much larger amount is adding to and taking away from Revelation.