The fact that the complexity and function of the universe and of nature -- the basis of your claim of intelligent design -- can be explained without intelligence or conscious design, by ordinary, observable chemistry and physics, obviates the need for any supernatural special pleading.
The fact that you can wave your hand and say 'ordinary observable chemistry and physics' does not take away the complexity of what is in that wave. Basically what you are saying is that you can't see a designer and so no designer is needed. And if there is no designer needed when you cannot see one then you are saying that there was no designer there.
This of course is a long way from deferred belief, which you claim.
And there's abundant evidence of the former, and neither need or evidence o the latter.
So are you following the evidence and saying that there is no designer OR are you deferring belief in a designer?
You can't do both.
But it does know how to reason, and until there is some actual evidence for a designer, the reasonable position is to defer belief.
Science knows that there is no empirical evidence that there is no designer unless you want to call the "lack of evidence for a designer", actual evidence that there is no designer. (the appeal to ignorance fallacy) but that does not stop most scientists from taking a stance and not sitting on the fence when it comes to their beliefs about Gods.
In life the belief of most of them would be that there no gods, that gods are irrelevant.
In a discussion like this however where they might want to be seen to be logical, they would say that they have just deferred belief in a designer (until they die of course when nobody will want them to explain their belief in empiricism and rejection of the history of God revealing Himself to humanity and to explain why they did not live as if God existed, if they seriously lacked belief either way.)