Detecting design or intent in nature

[Mudhammam]

1. randomness is used by intellect in designed systems all the time. A craps game for instance. The dice roll occurs regardless if the result is going to beneficial to house or not.

Yeah... except that the whole point of your inferring design in evolution is the assumption that mutations, beneficial or not, are intended to achieve a specific ends for the species... a claim that is refuted by all observation. Moreover, as Coyne also states, "we never see adaptations that benefit the species at the expense of the individual---something that we might have expected if organisms were designed by a beneficent creator."

2.My argument is based solely on experience and observation and doesn't go beyond that.

Then all you're arguing for is a principle of order in nature, not an intellect, and that is, rather than an explanation, the very thing that needs to be explained.

3. It is one thing to say a supernatural being explains evolution and another thing to say evolutionary systems require intellects to come into existence. You can falsify one proposition but not the other.

Which one are you suggesting is falsifiable?

4. Some material processes require intellect. Why can't evolution be one of them?

What material processes require intellect? As others have pointed out, referring to objects human beings have designed, by imitating and manipulating nature's regularities for their purposes, doesn't apply here.