Where? You claimed my argument boiled down to "We're here, so X must be true. It's a tautology. You're answering the question "how did we get here with an infinite past" by saying "we're here".", but as I stated in the next post, that is not my argument at all. My point is that the problem of 'how did we get to now?' doesn't make sense, because a) 'now' is wherever it is we happen to be, and b) we don't 'get here', because that implies an origin point, which doesn't exist in this hypothetical, eternal universe.
The question does make sense, unless you abandon causality and the arrow of time. And again, your response was a tautology. Then, saying the question doesn't make sense is not valid, because we do traverse time as we live our lives, and the planet traversed time as it was formed, and the star from which we got our heavy elements from traversed time. All of these finite, yet, you think that there is an infinite past. This is true even if time is inseperable from the other dimensions.
Think of it this way: if the universe is eternal, then an infinite amount of time has elapsed before 'now'. The problem of who we could have traversed an infinite distance with finite steps is solved: we have an infinite number of finite steps.
If there is an infinite number of finite steps behind us, how are we then here? You cannot get to infinity by the addition of steps. By definition, if you can add something to infinity, you're not there yet.
The 'present' is a volume in 4D spacetime, nothing more.
What was yesterday? A somewhat smaller volume? That implies change which implies time. Even if all events, past, present, and future, exist simultaneously, consciously we're moving from one 4d (or more) still shot to the next, in a certain direction.
Because one can never count down from infinity to zero. Another paradox is why, were you to be counting down from infinity, did you not get to 0 yesterday?
Suffice to say if you've once and for all solved the problem of an infinite past, there is a Department of Philosophy or ten with a chair and tenure to give you.