Actually we are all to be of one mind and one accord. The church has not yet been perfected. But we will all have the Mind of Christ and we will all think the Divine thoughts of God. I understand that you think a YEC is different from a GAP, but we are just not talking about the same thing. They both agree on the last 6,000 years. The GAP just talks about what happened between 6,000 and 12,000 years ago. So they are not talking about the same thing at all.
Nonetheless, a large section of the US population genuinely believes the Earth has only gone round the Sun about 6000 times, while a large section of the Western world outside the US genuinely believes that the Earth has gone round the Sun
billions of times. This is not a small difference, it's not splitting hairs, it has real-world implications (namely, it is the cause of the erosion of the intelligence of the people of the US, the corruption of children's minds, and the systematic failure of the US to remain a power to be taken seriously).
There are other major divides, too. Some Christians genuinely believe Catholics are not True Christians, while Catholics and other Christians disagree. Some Christians believe non-believers are destined for an eternity of suffering, some don't.
These are not minor differences, like whether to say "forgive us our sins" or "forgive us our trespasses". These are a major theological disconnects. They're mutually exclusive, and cut to the core of Christian belief.
This is what I mean when I say Christianity isn't a single, coherent set of beliefs. This is the reason why you see Christians on CF preaching things that you find reprehensible. They likely find the things
you say to be reprehensible and anti-Christian, too.
Do you mean Dante's book? It's not the Bible. Paul said the day will come when people will enter into a more perfect understanding. Sometimes we have to be patient and wait for people to mature and grow up.
Unfortunately, we don't have that time. Kids are being shot dead in the US, kids are starving of famine in Africa, kids are being raped to death because of sex trafficking. The eternal question that must be answered by the theist is, why would God allow these things to happen?