Simple mental exercise to show the irrationality of the Christian God.

[kılıç_mehmet]

Well, I'll try to play the devil's advocate as good as I can.

The bible says God is all loving.

I don't know where in the bible he says this, but okay, let's assume it does.

The bible also says that 'sinners' and/or people who don't believe in Jesus as the saviour will end up in hell.

Okay.

Think of the person in your life who is the most caring loving person you know. (For me it would be my Grandma who wouldn't hurt a fly). An all loving God would be more loving than the person you picked.

Ask yourself. Would the person you have picked send people to hell for eternity because they didn't believe in them (or their son) or because you broke a rule that they made.

It isn't really sending someone to hell because breaking a rule themselves...
As far as I'm concerned, generic christian theology maintains that Christ's sacrifice on the cross was to absolve mankind from the original sin of Adam and Eve.
Any other sin pales in comparison to the first and marking sin that was to be known as the fall of man.
Indeed, such a sin carried on by generations, and the generations to come, has to be absolved by such a great sacrifice, that it would be a great sin in itself to deny the person(which is another point of debate, the person of Christ, divine or not, God, God's son or whatever) that allows for such an absolvement.

Since you used your grandmother or any "loving person" as an analogy, I'll use this:
Say, your grandmother has been supportive to you since you were a baby. But suddenly, you turn on your grandmother, and you tell her that you don't love her anymore. You tell her that you do not see her as your grandmother, and she should not see you as her grandson, and never contact you again. You break off any contact and even call someone else that isn't your grandmother "grandmother".
Well, in such a case, would your grandmother continue to love you?
I'm not really sure, but I'm sure of one thing, that her attitude and thoughts about you would certainly change.
And since God's jealousy and vengefulness were made clear in the old testament, could you really expect God to forgive you for knowingly deny the sacrifice of his Son, and also deny his own being, and commit things that he told you not to do?

Under these circumstances, why would you oppose his decision of sending unbelievers who are aware of Christ's sacrifice to hell?

Of course, there also is the question of those who have no knowledge of Christ's existence. In that regard, Catholic dogma states that there also is a third plane of existence that is, in addition to heaven and hell, after death. Purgatory, where people who are not deemed to be as sinful or evil for hell, but also not qualified for heaven go to.
For example, purgatory is said to be full of righteous heathens, who were born before Christ, but lead lives that were in accordance with the Christian faith and tenets. Such people will have the chance of joining the ranks of the people that will go to heaven.