Player skill required to play gods?

Bacchus and high skillcap are two words I do not associate with each other without laughing. Managing his Drunk-O-Meter is not difficult, just know that you only need 1/3rd of it filled for your belch to stun when you need it, and don't level his Chug until last because it's most mana-efficient at Rank 1, despite not filling as much as higher ranks. Meditation is also very useful on him to help with his mana, and can provide healing at Rank 3.

All of his skills are very easy to use. Belly Flops are easy to land once you're used to the timing, while Belch of the Gods simply demands that you watch out for the enemy's CC. Intoxicate is still one of the easiest ultimates in the game, just jump into a group and smash the jug, no buildup times or anything, just instant damage and drunkeness.

Hades and Sobek are tanks with have much higher skillcaps.
Hades requires knowing when to apply Blight for added debuffs and when to use just your skills as-is.
Sobek demands a lot of positioning knowledge to be effective with him. Missed charges can be very costly, and it takes practice to really make his Tail Whip knockback useful. He's also a mana-hog too.

I actually believe playing a tank/support properly is more difficult than playing any carry/assassin/mage. Ymir is one of those tanks that has a high skill ceiling, low skill floor. He can easily be your best friend or your worst enemy with wall placements. I've seen even top players completely screw over their teammates with a miss-timed, ill-placed wall and it's very easy for that wall to come up slightly off from where you expected it to be. I also have to agree with Hades and Bacchus also being high skill ceiling gods to use properly. Bacchus because of the mana management to keep him drunk and Hades because of his limited skill set. Ares is another tank that is either a complete fail or overpowered in the right hands. Hitting consecutive chains is crucial for him to succeed and it's not easy to do against good opponents.

playing a hades well in high ranked matches requires maybe not so much skill but a lot of game knowledge

well, it might be just me, but I started with playing tanks and I would recommend every single one of them for new players and would classify them as easy, but again it is preference and you might find mages, assassins or carries easier :P

I mean he's not the hardest but he definitely isn't 'easy' as a tank. Later in the game when your 1 basically puts you in drunk mode, maybe, but early on it's not the simplest to keep mana while staying tipsy/drunk, and knowing your limits as a rather low-damage tank, especially a magic user. Not many magic-using tanks have it easy, as there is only really Staff and Voidstone for that perfect Magic Power and defensive stats

He actually is... I have a lot of matches with him. The only thing that maybe a bit of getting used to is mana usage.

Try to play Bacchus...he isn't close to easy.

I think this is the list of easiest to hardest
5 old free gods
3 new free gods
Tanks
Carries
Assassin
Mages

There are most definitely high skillcap gods out there.

Hel immediately springs to mind.
Using her in the heat of a battle requires knowing when to use which skills, and being in the right stance at the right time. Ever since she started incurring cooldowns in her other stance after using skills, she became that much more difficult to play, to the point where she's borderline unusable (now just outright unusable thanks to the jungle meta).

Anhur also demands a lot of skill.
While he is considered to be overpowered in the eyes of pros, it actually takes considerable skill to make him feel that strong. Knowing how to use Disperse to set up combos with Impale and Shifting Sands is something I don't see average Anhur players utilizing, and I often find myself encountering this type of player way more often than the good ones that make pros scream OP.

there are barely any gods to begin with, much less high skill cap ones. But I suggest Chronos or Apollo. Since you know an assassin, Chronos is a mage with high amount of micromanagement, and Apollo requires you to be good at landing autoattacks very well, as well as knowing how to escape. Anhur is ranged and requires a good bit of skill, too