7 Reasons Joseph Smith Was A False Prophet 

This piece is adapted from the latest episode of Matt Fradd All Access. You can watch the full episode here.

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This is a controversial topic, so let’s dive right in: Joseph Smith, the founder of Mormonism, was a false prophet.

A couple of disclaimers, right off the bat: entire books have been written on this subject, so we’re only going to scratch the surface. And to my Mormon friends, I understand that some of this may be difficult to hear. And I just want you to know that this isn’t meant to be some kind of attack. I love you guys, but we have to get to the truth. I encourage you to hear what I have to say, look into it for yourself, and let me know what you think.

Here we go.

Reason #1: False Prophecies That Didn’t Come True 

Let’s start with one of the easiest ways to test a prophet: are their prophecies actually true? Deuteronomy 18:20-22 lays it out clearly: if what a prophet says doesn’t come true, then they’re not speaking for God.

Joseph Smith gave numerous revelations that are flat-out false.

For example, in 1842 Joseph Smith published a supposedly prophetic translation of real Egyptian documents he owned, which he called The Book of Abraham. He claimed, as a prophet, to translate specific Egyptian writings and drawings, and to know their meaning. Important to note, at the time, scholars couldn’t translate Egyptian. But now they can, and we know that his translations are simply wrong. In one drawing, Smith claimed one figure was “King Pharaoh, whose name is given in the characters above his head,” but it turns out this figure is the goddess Isis, and the characters above the head read, “Isis the great, the god’s mother.” He falsely claims the god Osiris is Abraham, and that the god Anubis is a slave. A prophet’s words have to match reality, and in Smith’s case, they just don’t.

Reason #2: Contradicting Revelations

Another red flag with Joseph Smith is his contradicting revelations. For example, the Book of Mormon says, “Is there more than one God? And he answered, No.” But in a later revelation, he says that “the Gods organized and formed the heavens and the earth,” and that righteous Mormons “shall be gods,” “from everlasting to everlasting,” with “all power.” Smith even claimed that God was once a man who became divine.

This is a huge change in foundational beliefs! If someone is truly a prophet of God, their message should be consistent, especially when it comes to who God is. Yet with Smith, we see clear contradictions that raise serious doubts about his claims to divine revelation.

Reason #3: The Book of Mormon’s Historical Problems 

Next, let’s talk about the Book of Mormon itself. Joseph Smith claimed it tells the history of ancient American civilizations, including the Nephites and Lamanites, who came from Jerusalem. But here’s the problem: there’s zero archaeological evidence for these civilizations. No cities, no artifacts, nothing.

Now, some might argue, “There’s little archaeological evidence for the Exodus, and Christians believe that.” But while evidence for the Exodus may be debated, there is some support — such as Egyptian records mentioning Semitic peoples and archaeological findings in the Sinai suggesting nomadic groups. Scholars continue to explore these possibilities.

With the Book of Mormon, however, we’re talking about entire civilizations that supposedly existed for thousands of years but did not leave behind a single trace. If these civilizations were real, we’d expect something — but we find nothing. That’s a major problem.

Reason #4: Fabrication & Plagiarism 

There’s also strong evidence that the Book of Mormon simply mirrors Joseph Smith’s time and place. Many books at this time, and in Smith’s area, theorized that the American Indians had come from Israel. And Smith lifted entire sections from the King James Bible, even copying translation errors from the King James Version into his “ancient” text. This isn’t the behavior of a divinely inspired prophet; it’s the behavior of someone fabricating a religious document.

Reason #5: Joseph Smith’s Dubious Character 

We can’t ignore the moral inconsistencies in Joseph Smith’s life. He secretly practiced polygamy and even married — and slept with — teenage girls, claiming he was divinely commanded to do so.

This is someone who violated the Christian principles of marriage and morality. A true prophet should be held to a high standard of holiness and integrity, but Smith’s life was filled with moral failures. It’s hard to reconcile that with someone who claims to be God’s chosen messenger.

But isn’t there polygamy in the Bible? Yes. But it’s important to note that polygamy in the Old Testament is descriptive, not prescriptive. And the New Testament makes it very clear that monogamy is the only expected and permitted form of marriage.

Reason #6: Contradictions in the First Vision Accounts 

Smith’s famous “First Vision,” where he claims to have seen God the Father and Jesus Christ, is foundational to Mormonism. But did you know there are multiple versions of this event that contradict each other?

In the earliest version, Smith says he saw only one figure, “the Lord,” but later versions claim he saw God the Father and Jesus as separate beings. If this vision were a true, divine encounter, it wouldn’t make sense for there to be conflicting stories about such a pivotal moment. The discrepancies suggest that Smith may have fabricated or embellished his experience over time.

Reason #7: The Problem of Polytheism 

Finally, Joseph Smith taught that God was once a man who became God, that humans can become gods in the same way, and that there are many gods in existence. That’s not just a different emphasis. It’s a different view of God altogether.

In the King Follett Discourse, Smith said that God “was once as we are now” and that we must learn how to become gods ourselves. In other words, God is not the eternal, uncreated Creator, but a being who progressed to divinity.

This is directly opposed to biblical monotheism. Isaiah 44:6 says, “I am the first and I am the last; apart from me there is no God.”

The Bible is clear: there is one God. Smith’s teaching of an eternal progression to godhood is not just unbiblical, it’s a complete departure from the Christian understanding of God’s nature. Any prophet who teaches something so fundamentally opposed to Scripture can’t be a true prophet of God.

Whether it’s his failed prophecies, shifting doctrines, or contradictions in his story, the evidence is compelling: Joseph Smith was a false prophet.

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If you’d like to learn more, see my interview with Joe Heschmeyer, The Incoherence of Mormonism.