Here is a short synopsis of the Christian belief system as gleaned from many posts:
God created the world, and humanity. Adam he created directly from dust, and then took a rib from Adam and created a woman. (Literal or allegorical?) He set up one test, which he knew humanity will fail. God became angry (when this anticipated failure happened) and cursed his creation. He chased out the humans from his presence. Sometime later, he became even angrier, and drowned the whole world, humans and animals alike in a huge flood. (Literal?)
Yet again sometime later, this immutable God changed his mind (new covenant?), and decided to give humanity another chance. So he became his own son, took all the sins of humanity on his own shoulder, and allowed himself to be crucified, so he can pardon the sins of humanity. (Why the charade? Why not just do it?) Of course he does not pardon all the sins, only the sins of those who are willing to eat his flesh and drink his blood (symbolically or really, is unclear).
Also it is a requirement that these humans who wish to be saved from everlasting damnation (again unclear what it means) must accept him as a savior, and must love him - of course freely and without coercion. If someone fails, then they will “freely” go to hell, a place, where is a total separation from God, the very same God who is everywhere (omnipresent).
Now, if someone accepts God, then he will be given an everlasting second of unspecified bliss and a perfect body when eternity ends. This will happen on Judgment Day, when God sits next to himself (Jesus), and dispenses perfect justice. Everyone who sinned, but repented before they had proof of God’s existence will be saved. Of course they do not deserve to be saved, it is actually God’s infinite mercy which will allow them to get into heaven. The very same justice or mercy (one gets confused at this point) will send the rest of us to everlasting torture or fire (unclear).
And all this happens, because God loves everyone, indiscriminately and wants to be loved by us, freely and without coercion. God could pardon the sins of everyone, but then he would not be just. God ought to send everyone to hell (because we deserve it - or maybe even worse!), but then he would not be merciful.
This infinite love (which is not an emotion - but an “act of will”) is not manifested here on Earth. God will allow the hungry go unfed, the sick uncured. God will not defend the tortured and raped. After all this world does not “matter”. Whatever happens here is of no consequence - with one exception.
The only thing that matters, that we accept every bit of misery that befalls on us as the just outcome of our sinful nature (installed by God) and glorify God for those instances when he lifts this misery from us. Which he cannot do very often, because then we would gain proof positive about his existence, and that would rob us of our free will to love him.
Now, a little clarification is in order. None of the words which describe God's "activity" are to be taken literally. Since God dwells outside time, all the words which describe God's activity should be replaced with the phrase "eternally willed". The resulting text is - strange... try it.
Well, this is it in a nutshell (by a nutcase?). Logical or illogical? More to the point: rational or irrational? You be the judge.
This summary is not meant to be mocking or sarcastic. It is not meant to be a caricature. It is how the “picture” is presented to the outsiders, be they of a different religion or an atheist. It was gleaned from the conversations on these forums, reading some apologist books and of course reading the Bible.