You realize that Thor actually succeeded in killing Kratos, right? Literally killed him then brought him back to life. Kratos himself admitted that Thor's attacks hit as heavy as he'd ever felt and that he was fortunate their battle didn't reach a conclusion.
You do also realize that the first fight is a complete non-factor because both parties were holding back massively? The whole "heavy as any as I have felt" thing was made from the PoV of a massively-holding-back Kratos with no Blades of Chaos on him, which at best would put Thor at like, Poseidon level at best, not only that, it's also about the blows Kratos has actually taken and lived to tell the tale, which again, includes the Brother Kings Poseidon and Hades before Kratos amps himself with Hades' soul.
Not only that, this same exact Kratos matches Thor blow-for-blow and then defeats him in their second rematch, in which Thor is visibly pissed, bloodlusted and no longer holding back as he straight up states he's allowed to kill him this time, and Kratos is still holding back, but he's a lot more serious than last time. The same hammer blow that temporarily killed Kratos? Kratos takes it like a ******* champ in the rematch and shrugs it off. We literally discussed this in the GOW Ragnarok discussion thread at detail, heck, this is gonna be put into the Notes section of Thor as per the upcoming CRT.
Thor's blows being stated to be as strong as any as Kratos has felt, is explicitly referring to only the blows that Kratos himself has taken and survived, and this is visibly referring to Kratos's massively-held-back state without even having the Blades of Chaos on him, whose best feats prior to the Hades Soul Amp are whacking Poseidon and beating Hades.
The reason I chose Hercules is that Hercules doesn't have as many hax compared to the other Greek gods, and I'm also unfamiliar with the previous GoW games that took place in the Greek mythology.
Then you should prolly start with actually reading the profiles at hand because Hercules, while lacking hax, has significant resistance to most of Kratos's equipment and has more than enough might to match him every step of the way. Anything strong enough to harm Hercules will in tandem, harm Kratos as well.
Thor can also amp himself using Mjolnir, which he did against Kratos in their second battle.
And then lost. Not to mention Kratos even had the Blades of Chaos this time around, which are even stronger than Leviathan and Mjolnir, and is still considered fodder compared to other Greek weaponry like the Blade of Artemis.