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if there is no evil there is no good... if there is no good there is no God
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IMO, this is flawed logically
make your case
"if there is no evil there is no good": first off, this asserts a causitive relationship when no such relationship is proven. Next, these are generalized terms that discount specifics - who or what defines evil and good? Because this is a generalized, non-proven assumption, what follows is based on accepting this flawed assumption, making the conclusion also flawed.
"... if there is no good there is no God": again, this conclusion is based on a faulty, non-proven causitive claim that good cannot exist without evil. This conclusion also prohibits other valid reasons for a God to be, i.e., there is a God who does not interfere; there is a God who doesn't care; there is a God who supports evil; there is a God who is neutral, while good and evil are man-made explanations; there is a God who allows without judgement the natural law of actions and consequences to operate.
I don't mean this as personal criticism as we all do this, but the construct of the argument appears to me as if a conclusion is believed (God and Satan exist) and an argument was created to support that conclusion. In my thinking, the better method is to start with a proven, verifiable premise and then see where that premise leads by logic.
Understand that this is simply IMO and not based on education in logic or argument theory - so my opinion and 5 bucks will get you a latte' at Starbucks.
It would be interesting to me to hear from someone well-schooled in logic and argument theory to chime in - any takers?