Do you believe that he was a prophet, if so why or why not... or just that he was a man who had billions of progeny because God blessed him? (Patriarch)
Yes, initially...that's what he was: a common man who at least uncommonly trusted God, taking Him at His Word, and ventured out on a journey. (Not all folks would have left their home territory to venture). God this turned this common man into someone not-so-common. (And what's wrong w/that?) Anyone that God established a special covenant with is no longer common; but is one set apart. (The term "holy" is not only linked with purity, but "set apart" for God's holy purposes...certainly Abram was)
Do you believe that he was a prophet, if so why or why not...
Yes, there is a verse about Abraham referred to as a prophet (I think it's in Gen. 20).
Certainly, the verse in the Pearl of Great Price that says God commanded Abraham to lie is very telling about the Mormon god and Joseph's Smith's view of this god.
...or just that he was a man who had billions of progeny because God blessed him? (Patriarch)
"Just a man..." No, anyone who is depicted as a "type" of the Father, as he was in Gen. 22, is more than just the one whose descendents would include Jesus. Also, I get the sense that a people group/spiritual patriarch almost seems like a "bland" role; is that the way you feel?
You forget to mention the most important progeny of Abraham are his spiritual progeny. It was through his descendent, Jesus, that all the world would be blessed. That goes way beyond "blood" to those who were covered by Jesus' blood.