The person that suggested you must have faith is on the side of not hearing a difference. Read a few of his threads on cables and that will be verified. I agree with Grannyring, listen for yourself. That is the only way. Assuming that we know how to measure everything that the human hearing mechanism can distinguish is incredibly arrogant. Fortunately, at one time, someone proved that the world is not flat. All of the scientists and people who knew beyond any doubt otherwise, thought him a fool for holding such beliefs without ever investigating themselves. Again, listen for yourself. It can be done with little to no investment other than time and an open mind.
A New Believer
I have listened to many systems over the years, and have never appreciated the difference speaker cables can make to a sound. In fact, I was so skeptical of the sound changes they can make that I have always not bothered with any special type of cables, generally going for generic (and dare I say it) roughly made ANY copper wire plugged in to amp and speaker. Well, imagine my surprise when I decided to do a blind test and listen to what difference cabling can make. Wow, my Vand 3A Sig's had been getting strangled! (some of you guys may want to strangle me if I told you what connects I had been using). So I am now a firm believer, cables DO make a difference.