No complexity can emerge from randomness, so all complexity must be designed, by a designer. Correct?
Surely the designer must be highly complex. Which means the designer must have been designed by an even more complex designer. I'm sure you see where this is going. In this scenario you can always keep asking "Who designed the designer?".
How do you get around this? I'm sure you'll say something along the lines of "the designer was not designed, he has always existed" but that is based on nothing but the Bible, and nowhere have you made the connection between the designer and God.
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