EXCUSE ME! Anyone who would conclude that we don't know of anything in the world that looks designed but isn't designed is begging the question. Outside the natural assembly of parts we find in nature there is absolutely no reason to conclude there is any kind of sentient "designer." Take the snowflake with its exceedingly orderly geometric shape. The ice crystals that make up snowflakes are symmetrical (or patterned) because they reflect the internal order of the crystal’s water molecules as they arrange themselves in predetermined spaces (known as “crystallization”) to form a six-sided snowflake.
"The intricate shape of a single arm of the snowflake is determined by the atmospheric conditions experienced by entire ice crystal as it falls. A crystal might begin to grow arms in one manner, and then minutes or even seconds later, slight changes in the surrounding temperature or humidity causes the crystal to grow in another way. Although the six-sided shape is always maintained, the ice crystal (and its six arms) may branch off in new directions. Because each arm experiences the same atmospheric conditions, the arms look identical."
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And that's it. There's no designer patterning each snowflake. So to conclude "then there must be a
design behind creation"---a purposeful enterprise---is a logically unsound leap of the imagination.
No, you can't use an analogy to deduce a truth in another context. All you can do with an analogy is to make a comparison or correspondence. In no way does an analog confer existence to any part of its target.
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