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Logic, pure logic. Let's consider the situation. A soul floats around the Earth. Since it's not in our plane of existence, it can't change anything here. Where did matter come from then? Situation 2. There was matter on Earth. It didn't think, but it reacted to certain events. What prevents a spirit from inhabiting such matter (for non-atheists), or why can't this organism become more complex and react differently to stimuli, with variations, and eventually become a human being (for atheists)?
For example, a body without a soul and a soul without a body can exist, while a body without consciousness cannot...
Ничего нет только у мёртвого - у живого есть хотя бы жизнь...