How Convincing Are Aquinas' Three Ways?

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Overall, I believe that Aquinas’ 3 ways are not very convincing as a proof of the existence of God. The different ways in which Aquinas try to prove the existence of God just make it either impossible for there not to be a God, which rejects any other ideas or, they make misleading assumptions that are not justified. My first reason for believing that Aquinas’ 3 ways are not very convincing is the 2nd way – from Cause. David Hume argues that you cannot see, hear or use any of your senses to see a cause. You cannot see a cause only two things happening in conjunction with one another. This to me makes me feel that the 2nd way – from Cause is not as strong as the other two arguments Aquinas puts forward. As Aquinas’ arguments are A Posteriori which means they come from experience, can Aquinas’ 2nd way really be A Posteriori? I do not think so as you are unable to experience a cause, therefore, the 2nd way cannot be convincing proof of the existence of God. Aquinas’ 3 ways make far too many leaps and assumptions. For Example, in the 2nd way – from Cause, the argument clearly states that everything has a cause, that cause must too have a cause, there cannot be an infinite number of causes therefore there must be an uncaused cause. The logic in this argument is sound however, when Aquinas makes the leap from there being an uncaused cause to that uncaused cause being God this is where I feel it falls. This leap is unjustified and therefore I don’t feel it is sufficient to be convincing as proof to the existence of God. Bertrand Russell would argue against the 2nd way with fallacy of composition. This means, just because everything in the universe has cause, it doesn’t mean that the universe itself has to have one. Why can’t the uncaused cause be the universe itself? In Aquinas’ 3 ways, Aquinas makes God an exception, if God is an exception why can’t the universe? In
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