Summary Point
Why is it NOT possible for all religions (belief systems) to be true?
Subpoints
It is logically impossible for all religions to be true because they each have core beliefs that contradict.
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A fundamental law of logic is that two statements cannot contradict and both be true.
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Law of Non-Contradiction: Impossible for something to be and not be at the same time and in the same sense.1
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Here is a statement that helps illustrate the point:
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The blue bird exists and does not exist (at the same time and same sense).
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Jesus confirmed the Law of Noncontradiction when He spoke about those who were either with Him or not with Him:
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Anyone who is not with Me is against Me, and anyone who does not gather with Me scatters. (Luke 11:23 CSB)
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When you apply this principle to religion, it is clear why they cannot all be true. Each major belief system makes claims that contradict other religions or belief systems.
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Theism, Pantheism and Atheism all have different views on what happens when you die, etc.
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Below are examples of core Christian beliefs that are different from other religions or worldviews; therefore, Christianity and other religions CANNOT both be true.
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Salvation
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Christianity: According to the Bible, salvation is only available through Jesus.
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Jesus told him, "I am the way, the truth, and the life. No one comes to the Father except through Me. (John 14:6 CSB emphasis added)
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There is salvation in no one else, for there is no other name under heaven given to people by which we must be saved. (Acts 4:12 CSB emphasis added)
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Other religions have different viewpoints on salvation, which contradict the claims of Christianity.
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Identify of Jesus of Nazareth
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Christianity: Claims that Jesus is God.
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Some other major religions claim Jesus was a prophet or good teacher, not God.
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Trinity
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Christianity: Believes in a triune God (God is one in essence, but three persons, Father, Son and Holy Spirit). Jesus said the following:
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"Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit, (Matthew 28:19 NASB)
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No other religion believes in the triune God.
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Logical Fallacy to say:
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"There is a blue bird and not a blue bird."
Links to external resources on this topic:
Sources (complete reference information provided on SOURCE PAGE):
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Geisler & Turek, I Don’t Have Enough Faith to Be an Atheist, p.56.