Theoretically you are correct. Anything that contradicts scripture is indeed false. But
@St. SteVen had a valid point. When the Reformation began in the 15th-16 century, everyone was coming out of Catholicism based on the evidence of scripture that exposed not only the false doctrines of Rome and her flagrant ignorance of and disdain for the word of God, but even more so the fact that the scriptures identified Rome as the Antichrist. For those hearing Protestant teaching for the first time, it was new, and sadly, every subsequent truth that the reformers revealed from scripture, was opposed and condemned as heresy by the earlier reformers, and then persecuted those who accepted these new truths. The Lutherans persecuted the Calvinists, the Calvinists persecuted the Baptists, the Baptists persecuted the Methodists etc.
Today, many modern evangelicals and Pentecostals criticise those who in the past who were coming out of Catholicism but hadn't received complete light and understanding, while at the same time adopting modern concepts that were rejected by the reformers, such as dispensationalism, the prominence of the nation of Israel in Bible prophecy, and antinomianism. And they have abandoned the one doctrine all the reformers agreed on, the identity of the Antichrist? And why? Because they have actually abandoned the scriptures in favour of popular fictional novels and movies, awaiting a fictional lone ranger atheistic Christian despising anti-semite tyrant taking over the world. In order to arrive at this conclusion there is no harmony in prophecy or in its interpretation, but stand alone texts are cobbled together to fit into a predetermined futurist hermeneutic. All the evidence that the reformers had from the scriptures and history is ignored. So who really is the cult these days?