What beliefs would we consider reasonable for a self proclaimed Christian to hold?

[Succubus]

Overall, an excellent post Whateverist but I'm rather confused as to why you give them so much leeway, as in:

As with souls and an afterlife, any beliefs regarding the nature of God which doesn't contradict life as we know it, would be reasonable and insistence that any particular point of view should be accepted by all would be unreasonable - or else justified in a manner which doesn't claim an unearned authority.

Everything we know about 'life as we know it' tells us that souls and the afterlife are unfalsifiable propositions and as such should be dismissed without a second thought. There is nothing reasonable about belief in the soul, it was ridiculous nonsense two thousand years ago and it's ridiculous nonsense now. In effect you are giving them unlimited discretionary powers to believe anything, everything  and nothing, don't they do this anyway?
Just look at some recent propositions by 'liberal Christian thinkers' on the subject of atheists and hell. They use so much 'spin' in their attempts to redefine God into existence that the G-forces involved have rendered what remains of actual church teachings and dogma into shrapnel.

All that remains is a nice warm feeling, ie, standard issue cafeteria Christians who are utterly incapable of describing what it is they actually believe. I have more respect for the fire and brimstone fundies, at least they actually believe something.