So you're putting your faith in the geological evidence.
Is that a trick question, or do you think following rational investigations to logical conclusions is a bad idea?
Trust, not faith.
And it is far from just geological evidence. Do you recall my mention of DNA? Archaeology? Cultural continuity?
To that list you can add a lot of other interrelated fields.
I fear it is you who is relying on faith. That's fine, but please don't mistake religious belief for scientific evidence (hmmmm, there's a tagline in there somewhere).