I don't want to sound like I'm splitting hairs, but is an engineer a scientist? To my knowledge, engineers apply science but don't "do" science. They apply principles which they learn in school but they don't perform scientific studies to discover new information and test hypotheses.
Therefore, they are not trained to have the critical mindset of a scientist. This is why so many engineers are religious, because they don't have the same standards of evidence as scientists. They look at a natural object that is complex and works well, and assume it is designed because they do similar work themselves.
I am an engineer, partly the problem resides in the fact that engineer is not a protected title, anyone can call themselves an engineer. No doubt the guy who comes to fix your plumbing or heating will call themselves an engineer.
It also depends on what specialisation the engineer goes into, personally I work in research and development and so we are looking for new ways of doing things, we work with universities to test new ideas. Engineering is practical science so at it's best it does use the exact same mindset as a scientist. If I am designing something I want to see empirical evidence that it works, I want to find anything that proves me wrong and I have to have my peers look at my work critically to find flaws and mistakes.
I don't see design in natural objects, in fact the design work I do tells me that there are some examples of natural objects that you wouldn't design that way ever if you had a choice.
Whilst I have no doubt that some engineers are religious (particularly in an overly religious country) doesn't mean that we all are.