For instance take a really round stone found in a river, let's imagine this stone rounded itself (or to be more exact the stone was rounded by the water/sand and alot of time) or there was a person who rounded it... Some things (even very complicated ones) are better explained by natural processes than to be artificially made.

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Nobody is there to give me life and death. Or to be more exact it would be that my parents gave me life and my murderer or time will "give" me death.

If god would someday decide to just not exist anymore (which he could because he is allmighty by definition) do you believe that you could no longer die, no matter what you try to kill yourself? Or that you can then never have children?