How to convert Christians to atheists in 30 seconds (ironically, using bible)

[Ignorant]

We would presume that God does not want that either.  Yet... [1]

Humans have been around for thousands --tens of thousands, at least-- of years and we have had the word of many gods given us over the past several centuries.  In spite of hundreds of years of meditation and discussion and research and learning, we still cannot seem to know God with sufficient certainty that even a simple majority of people follow him.  Among the major religions we have a great deal of fragmentation, some of it major and some of it minor.  Many individuals within specific denominations may not know the belief systems they claim to follow aside from some basics.  It seems that we have been left purposely adrift, with many billions of people sharing only two beliefs-- that God exists, and that it's my God (or conversely, that it isn't your god). [2]

He also said “Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. But small is the gate and narrow the road that leads to life, and only a few find it." -Matthew 7:13,14.  This is God himself (or His son, depending on your denomination) who admits that it is difficult to locate and follow the right path and that only a few even find it, much less navigate it successfully. [3]

How can we square the image of a God who wants us all to join him in an eternal heaven with the one who wrote off most of humanity thousands of years ago? [4]

1) We'll get to that...

2) Yes, the lack of unity is scandalizing. There are only two possibilities. Either EVERYONE is wrong about god, OR one group has it all right. Everyone tends to think they are that group. 

But if one group has it ALL right, that doesn't mean that everyone else has it ALL wrong. It's not all or nothing. Some people have most things right, but are missing other things. Some have most things wrong, even if they have some things right. As I've said several times already: The bare minimum is that you live your life according to the truth and goodness that you know and are honestly trying to know more about. God can work with that. He can work with anything if that disposition is at the center of your life. 

So if that center of your life lives according to an incomplete version of god as truth and goodness, God can work with that, and he will judge you according to how much you know about truth. The more you know about the truth about god, the more evident it becomes if your central attitude is not one of acting in truth and goodness and progressing in the knowledge of those things. But if that disposition remains, AND you have the full knowledge of god he has given, you can live a truly divine life in THIS life. You won't have to wait.

3) Yes. Perhaps few people care to grow in the knowledge of truth and goodness? Maybe, knowing that, God sent his son to give them this knowledge gratuitously.

4) While I would not accept the suggestion that god wrote people off, you ask a good question. This is what I would say. What-god-wants is for his creatures to come to the fullness of what they are. God's will for people's life, therefore, is expressed and evident in what-humanity-is. Just by being human, you express to others that God made people to achieve full-humanity through their own actions. In other words, since being fully-human means to become human-goodness, your own humanity is a sign of what-god-wants, i.e. eternal life of goodness.

Everyone does not necessarily reach this fullness. Not everyone actually lives in a way that fills their humanity with goodness, even though god made them as things which seek to do this.