“...if we were all true Christians, the world WOULD be a much better place.”
My only concern would be who gets to decide out of the umpteen dozen denominations which one is the TRUE Christian Church?
God.
The best thing to do is bypass denominational lines and look to the Bible itself. That is the only 100% trustworthy authority. No man can claim that title.
Not really a problem. There is a “true Christian”, whatever it is, and if we all were one of them the world would be a better place.
It’s not the joining of a common demonination that would lead to a “better place”. It would be the fact of an entire world of humans all in a right relationship with God.
There is no chance of that this side of the end. We are not destined to be universally saved. And we are not destined to live in a peaceful heaven on earth world.