re: Civ 6

The more I play, the more I realize diplomacy needs some serious fixing.

-Casus belli doesn't really work. Saladin settled like 4 cities RIGHT on my borders after I asked him not to. I couldn't declare anything but formal war or surprise war. I denounced, waited, everything. Never had the option.
-I can't declare peace. Gilgamesh DoWed me (still don't know why) while he was a good ways away. He sent a small fragmented army that I destroyed with ease. I didn't want to war but he would never accept my peace offer.
-Greece declared on me EARLY while on another continent. Never saw a unit of his. Never engaged in battle. Offered peace after like 40 turns. I tried offering peace multiple times...no luck. My city had a war weariness penalty the entire time. Why?
-Speaking of peace, Gilgamesh offered a city. I didn't want it so I removed it from the deal. He wouldn't accept the deal.
-Early war makes it frustrating. I've played a couple games where Greece, India, Konga, or Gilgamesh will declare on me within 25 turns. That doesn't bother me a ton, but they have full-fledged armies. How are they getting 6+ mounted units and archers that quick?
-Modifiers for relationships need to be altered. Brazil and China hate me as soon as I get a great person or build a wonder. I understand a negative modifier, and that's cool. I just think it should be ONE component of it. It makes relationships difficult.
-Something has GOT to be done about the religion spamming. I've had multiple games where the AI will have religious units blocking every tile in my city's 3-tile radius. I can't move my military, my great people....I can't even go improve a tile. I like the religion mechanic but holy hell, that's absurd.