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

[Tonus]

3) Yes, that is exactly what that implies. I don't want that for anyone.

We would presume that God does not want that either.  Yet...

4) It depends on the extent of their interaction with the revelation of that knowledge in this life, and again, there are more variables in play than we usually think. There can be many different reasons why people don't come to know of this truth. Some of those reasons can be their fault. Others perhaps not. God sorts that out in the end. Like I've said before, God's mercy reaches farther than we tend to consider. The most fundamental thing is to seek the truth, and to remain open to truth, and to act according to what you honestly think is true. God can work with that, but he wants to give you more. He wants to give you his own divinity.

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).

"I came so that they might have life and have it more abundantly." -John 10:10

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.

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?