Hi Naomi
Firstly, I can only give my personal responses but hopefully they may help you to understand my own position a little clearer.
/But they believe that every other god is a product of man’s imagination. Why not this one?/ Because clearly they have personal experience with their God which leads them to trust in the Bible. I believe the Bible is clear there is only one true God, as Paul demonstrated in his address at Athens.
/A Christian posting on another thread denied emphatically that the Bible condemns non-believers to death … but it does./ I couldn't comment on the experience or belief of another Christian. Suffice to say, when Paul was in Philippi he saved his jailor from committing suicide by pointing him to belief in Jesus. Men may condemn themselves by their choices and actions, but that is not God's desire, who would have all men to be saved.
/Additionally, that God is reputed among Christians to be omnipotent, but scripture tells us differently, so I question just how much ‘scripture’ Christians actually know./ God is certainly described in different ways throughout the Bible, sometimes as a "consuming fire" or as "rich in mercy". But God is clearly both these things. A fair father may sometimes appear to his children as strict at times or loving, or caring or firm. This is not inconsistency.
/The popular myth of God’s loving, just, and compassionate nature very clearly emanates from the imagination of man/ I disagree. I would say it very clearly isn't. Man's imagination can encompass a harsh and unforgiving God, but it is difficult to apprehend His undeserved mercy, grace and love which is boundless and towards the sinner. The parable of the younger son in Luke 15 is an example of this and has certainly been my experience.
/but I happen to think that the bible contains a wealth of history./ It sure does, and what wealth!