Are you saying space aliens are plausible?
Because Behe says ID is not about religion.
No .... the space aliens are your idea.
The reason I say ID is "inherently plausible" is because we humans have an innate understanding of the concept of design -- we practice it all the time, and so it's not that hard to extend the idea to the origin or development of life. (And on the latter, it's all the more plausible because we've been using ID to influence the development of life for thousands of years.)
Whether or not ID is a true explanation of things, it is nevertheless true that we can think about how we would go about the process of creating life.
I'm guessing that with about 10 seconds of thought you, personally, could sketch out at a top level the steps needed to do it, and within a minute you'd probably be diving into one or another of the vexing questions (e.g., how would you store and retrieve information....?)
See what I'm getting at?