Struggling" with doubt is often looked on as an admirable thing, fighting the good fight and all that. But ultimately we have no control over what we believe, and struggling is a way of trying to steer something that is unsteerable. You will make the best sense of the world you can based on what you see and your honest reflections.
Either this Christian God is worthy of worship or he/it is not. (or, doesn't exist). If you become convinced on one point or another, then no amount of struggle, or wishing, should change the situation.
Nor will it.
My Opinion. If I had only the information that you have acquired so far in your life, I would have to come a very similar conclusion. That is why for a period in my life I rejected the concept of God, because of similar things that I learned.
I read a book on the worst criminals of history, and 1/3 of it was on the crimes of the Church, both as a group and by individual popes. But I found out that God had a different plan that the churches claim. First that he had made it a command that Christians share in the ministry.
That is why it grew so fast in the first century. While today the "Christians" let their clergy do the ministry, in the first century it was ALL the Christians that spread the word. I joined a faith that follows that commission.
Second, while the churches teach only righteous people will be resurrected, and the rest go to hell, the Bible says all dead human go to hell. Why? Because the "hell' of the Bible is simply the grave, where all men have gone since Adam.
And from those graves there will be a resurrection of the righteous AND unrighteous. (Acts 24:14-15) 14 But I do admit this to you, that, according to the way that they call a ‘sect,’ in this manner I am rendering sacred service to the God of my forefathers, as I believe all the things set forth in the Law and written in the Prophets; 15 and I have hope toward God, which hope these men themselves also entertain, that there is going to be a resurrection of both the righteous and the unrighteous. This resurrection Revelation 20 shows is not just to send those unrighteous back into a lake of fire, but to let them have that missed opportunity to know about the ransom that Christ paid to free them from the grave.
It will be up to them what they do with it then. And on the issue of those who claimed to be Christians and worked evil upon their fellowman, these ones will be up to God whether He sees that they could be reformed. We know by the words of Jesus about some during his day that they committed a sin that is unforgivable.
So, please take time to consider the articles below. They cover many of the topics that are part of your search for answers.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.