You sound like you have a good head on your shoulders. Please explain how GPS works ... That should be right up your line! No cutting and pasting - right out of your head.
GPS off the top of my head.
Triginometry.
There is a constellation of a dozen or so (can't remember the exact number) satellites in low earth orbit. Each of these satellites emits an ultra precise, coded clock signal. The satellites know exactly where they are in earth orbit.
A GPS receiver takes these signals and calculates the position on earth based on the received satellite signals.
My position is not irrational. It is actually very rational. It only requires faith in something you cannot see, but of which you see an abundance of evidence.
The same COULD be said for evolution. However, the evolutionists deride faith and expect everything to be based on evidence in hand.
The dismissal of an intelligent designer puts you in the uncomfortable position of having to produce a rational explaination for anger, happiness, humor, sympathy, sadness and conscience.
Good luck.