Complete flapdoodle, Hib. Both the salinity and magnetic argument. If I thought you'd actually be open to discussing science I'd be happy to reply. Neither of your claims are even remotely based in reality.
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As to your question of why I'm an atheist (by the way, you are ignoring the most pressing aspect of that post which had some small chance of making our discussion productive), I could follow your logic and say that I'm an atheist because there are no gods. They were all made up. But, being more generous than that, many people want me to believe that their god is real, and let them use that belief to make the world the way they want without actually basing decisions on what works in reality for everyone. However, none of them are much more convincing than any others. I say that after 14 years in an Evangelical Lutheran education, 8 years as a JW, where I spent thousands of hours in ministry work in 2 languages and 3 continents meeting people of all different belief systems, and traveling to some very poor developing nations. So, I don't believe in any gods because the claims made by religious people either can not be known or are in conflict with what we can know about history and science.
If you are willing to take on looking into your beliefs, then I would direct you to the words of Stalin, in that it is not enough to hear your opponent's view presented by one who doesn't agree with it. To truly understand an issue you must hear the contrary arguments as stated by their most capable proponents. I know this is true, because it is the way I left Jehovah's Witnesses.