Christianism would actually be something good if the people practiced what they preach.
That being said, I tend to agree that believing in something for which there is no evidence is so close-minded that it gets in the way. For many aspects of life, it helps you immensely though, such as going through rough patches in your life (everyone goes through that). But when it comes to science, it's very limiting. http://www.youtube.com/watch?v=3zi699WzA…
I asked him where the dimensions he speaks of came from and he says, they were just there.
You asked a very good question and your friend gave a very bad answer. His very bad answer comes from his ignorance, unfortunately. I don't know what your friend read that made him believe that he understood it all, but you just revealed to him that you can't learn science from reading from a magazine at a dentists' office or while "researching" (yeah right) the Internet.
His best answer would have been "I don't know, I was told that it's this way". Which is also what you do as well, you were told in what to believe and so you do. Except that science isn't a religion, it's both a process and a collection of evidence.
anyone had ever proved that they exist? his response, No
A little better than before. On the concept of proof and how people like to provoke scientists: http://www.youtube.com/watch?v=wLaRXYai1…
I then said, So you have faith that these dimensions exist even though you, and no-one else, has, or ever will have any proof of? he then shrugs
That's basically it.
Remember those math exercises where you're asked to predict the next number in a sequence? You think you have figured the "rule" that produces the sequence (you have a "theory" for it, as people usually call it), so you make a prediction of what the next number is. You then go to the solutions (make the experiment). If it disagrees with your prediction, it's wrong. http://www.youtube.com/watch?v=b240PGCMw…