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

[Whateverist]

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.

All I can say is that a reasonable Christian needs to accept life in a pluralistic society in which many -including those who also claim the mantle of belief- reject as an empty set anything claimed to be supernatural.  So long as they weren't pushy or condescending about it I think the rest of us should be able to deal with it as quaint or as though they are a little late in transiting a developmental stage.  We might have to deal with the fact that there will always be a portion of the population  whose response toward big questions evoke literalism.  Still, not bad for species of chimpanzee who has only recently learned to manipulate abstract ideas.  So long as no one starts swinging the jaw bone of an ass down on any ones head I say we need to deal with it.  We may or may not all be prepared to handle this shit.