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Arguing whether God exists or not is useless to everyone.
Not necessarily. What if you have a discussion with your religious friend, and convince him God isn't real? You have just saved him/her a great deal of time and money.
1 fallacy reported.
Begging The Question
It assumes God isn't real, when the question is about how arguing whether God exists or not is useful or useless.
People can learn much from how each person responds and supports their response.
There are many "exclusive truth" claiming organizations that argue they are the only way to communicate with God. (Mormonism, Watchtower/Jehovah's Witness', cults in general) If God were proven to not exist these organizations would cease to exist saving millions of people from being manipulated.
It's not possible to ever conclusively "prove" that God(s) do not exist (impossibility of proving a negative), but that does not mean that the discussion/debate doesn't serve a purpose.
For christians, christianity places emphasis on the teachings of Jesus (e.g. treat others the way you want to be treated, etc), not on the existence of God or the beginning of the universe.
It is not useless to people who benefit from believers such as pastors.
Many people in power make choices based on these beliefs, so it will never be useless to argue
Arguments involving God's existence exercise critical thinking, too.
Nearly every argument proving and disproving God's existence can be countered.
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