>>6
"Faith" is a misleading term in this context (and it doesn't even apply, really), but basically, the scientific method is the most reliable way of arriving at truth there is. It may only give you approximations, but that's better than the alternatives, which only give you shots in the dark.
>>7
For the record, my money is on a saddle-shaped, finite, unbounded universe. The evidence for that seems to be pretty good.