I usually get into discussions with folks about God, and many a times, some of them will go, "It's called faith." And so I thought I should respond to this "argument" and the next time I get into it, I'll just paste this to them. :D
I don't think we should rely on "faith" being our excuse for believing in God. Why? Because "faith" can be the answer to ANYTHING. When Muslims claim they've discovered some scientific discrepancies in the Bible, some of us go, "OMG! How can ANYONE accept that religion then?! OBVIOUSLY, Islam is the right religion, since it's FULL of Science! SubhanAllah! All anyone has to do is read the Quran!" etc.,etc. We don't realize that just as we use the pretext of "faith" to defend our belief in God, the non-Muslims whose books are supposedly filled with scientific "mistakes" ALSO believe that their belief in their religion/God is a matter of faith and faith alone and that they need nothing else to "prove" their belief.
Similarly, Hindus can simply say, "How dare you call the Gods/Goddesses I worship 'mere idols'?! They're our GODS! They mean EVERYTHING to us; they're the REASON we live; they're the first thing we think of in the morning and the last thing we pray to before we sleep. This is faith. And it's OUR faith. And it's important to us."
So, if we're really gonna say that "it's a matter of faith" when we're questioned why we believe in God, we should also remember that ALL people are on the right path then because for them, just like for us, faith is just that important. It's "faith" that guides us towards whatever Path we've chosen, or whatever Path that has been chosen for us by our elders/parents/scholars/whoever.