There is simply no rational need for the inclusion of a deity.

I agree with this statement, but feel compelled to add a qualifier.

Evolution or any other scientific study is not enhanced nor diminished by the inclusion or exclusion of a diety... anymore than is a mathematical equation or arithmatic exercise. That said, people of faith have a need to view things through their faith... those of no faith lack that need and so "exclude" faith from the deal.

As long as it "makes no nevermind", inclusion fails Occam's Razor but does no harm either. And it does meet an emotional need in humans.

BUT... when the emotional needs of people interfere with the scientific exploration of the world around us, then I am forces to say "stick to your own playground & leave us alone to play in ours".

A parting thought... I suspect that in a "reality" where a book with all the answers were to suddenly appear... those of faith would cherish it and repeat sections of it to enhance the experience...

and then there would be those like me who would take it and examine it and then test each answer to see if it holds true.