And most of us take alot of what we call science on faith as well. I have never seen an electron, but I believe they exist. Science is a social practice and not "Truth" either. It is based on theories and using evidence to support that theory. It was once scientific fact that the sun revolved around the earth. Science is not infallible.
But...we have an enormous amount of hard, demonstrable evidence for the existence of electrons, including tracks in emulsions and a zillion other things. To take your argument a step further, I've never seen my brain, but I believe it's there. But if I really doubt its existence, I can prove that it's there with a simple MRI or CAT scan.
Science is a process that never claimed to be infallible (though religions and religious leaders make this claim). It requires that your ideas be proven right in order for them be accepted.
All responsible scientists accept this idea: if you can prove that I was wrong, then I have to reconsider my ideas.
As for the sun going around the earth, the guy who discovered that this wasn't true was forced by religious leaders to take it all back or die, was nearly labeled a heretic, and spent the rest of his life under house arrest. The church didn't fully remove his works from their list of prohibited books until ~250 years later. So, not the best example.
