Skills aren't designed to pair with classes.
Intelligence checks are about what you know. Usually this means facts, although there is a certain degree of figuring things out sometimes (usually investigation). Religion checks are about what you know/remember about religion and gods. Nature checks are about what you know/remember about nature (what you know about a specific plant or animal, for example).
Wisdom checks are about noticing and understanding things in the world. Survival checks are about noticing details in the world that you can use, such as following tracks or recognizing good places to camp.
Charisma checks are about how you present yourself to the world. You can be very strong, but not present yourself in an intimidating way. Or you can be so weak that you can barely support your own weight, but still be intimidating because you know just what to say and just how to say it. Deception isn't about knowing that what you're saying is a lie - it's about knowing how to present the lie so that other people accept it.
Nope, doesn't make any sense at all even lorewise specially when it comes to Druids and Rangers. There is no use for the int stat in a Druid and Ranger. Only Investigation makes sense for Intelligence Skill with Ranger and Bounty Hunter has it since it's a tracker.
You actually need a certain degree of knowledge ( Intelligence ) for deception since not every npc you encounter would be a halfwit with 2 neurons where you can just make shit up. Take for instance Shadowheart. She would make a lot more sense having more intelligence since manipulation also needs a certain degree of intelligence and she would get that bonus to Religion as well.
