You're making a fundamental error. There is a huge difference between "intelligent design" (small case), which points to God, and "The Intelligent Design Movement", which points in every possible direction, including aliens from outer space (which is why even some atheists are involved in that movement).
On a side note: The creation itself provides a "general" revelation to all rational people that there is a Creator (God) --- HOWEVER - the creation alone doesn't point to Christ, the Savior. That takes a "special" revelation not given to all. The Cross is foolishness to those whom God hasn't given to Christ. John 17:6
My inference wasnt to specifically point out a designer, just that the idea that there is a design in nature is old. While there are many that use it to specify a deity, that is beyond my point. BTW alien creation IMO is a self defeating proposition.