I have a friend who is an Atheist because he claims that the burden of proof

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I have a friend who is an Atheist because he claims that the burden of proof (for the existence of God/other practices and belief's) is on religion and he has not been satisfied with any proof set forth. He says, "if you propose the existence of something, you must follow the scientific method in your defense of its existence. Otherwise, I have no reason to listen to you." Should one believe in God or practice religion only if it can be proven by the scientific method? What do you think of his reasoning? Is it rational to believe in a God/Religion without the SM? Thanks and I'm a huge fan of the site!