If spirit existed in a physical sense (no pun intended) you could buy it in a jar and rub it on like ointment.

This makes no sense to me. Why should one have to buy something in a jar that is freely available, everywhere, all the time?

This is simply wrong. The whole point of scientific process is to examine without prejudice. Sure. tons of people have twisted results to meet perceptions, but they fool only themselves as science will always find them out.

Science is constantly correcting itself to accomodate new ways of understanding and percieving sense stimuli. Science is not static. As perceptions change, so does science.