Earlier quoted context omitted.
No. I believe the official version (that the reason the intelligence agencies are accusing Russia of hacking the DNC is because believe it did) because the alternative is less plausible and there's no evidence for it. That's pure Occam's Razor, no faith involved. The FBI has lied and will lie again, getting me to believe they lied about something is not hard, but they don't generally do it in big, obvious ways that a…
That's not how Occam's razor works. You don't pick the most likely single outcome and then just assume that to be true with 100% confidence. Occam's razor is just an informal statement of the fact that you should assign a higher a priori probability to simpler hypotheses. It doesn't mean you should ignore any marginally less likely hypothesis.
(Please remember what question we're trying to answer. It is not "Who hacked the DNC?". We are not in a position to know; hell, we don't even know there was a hack. It is also not "Is the FBI trustworthy?" Of course they're not. It is "Why are US intelligence agencies saying they have proof that Russia hacked the DNC?" The base hypothesis is "Because they do." The alternate hypothesis is what you're supplying.)