I say then: Walk in the Spirit, and you shall not fulfill the lust of the flesh. Gal 5:16

The flesh, the carnal nature, is at odds with the Spirit. Likewise, the Spirit is also at odds with the flesh. It is a constant battle between the two.
You are proof of the conflict. You feel the tug within yourself each day. Pulled to sin or pulled to do what is right.

The Spirit desires for you to walk with God. The flesh prompts you to run away from God.
Anyone that commits adultery, fornication, uncleanness, lewdness, idolatry, sorcery, hatred, contentions, jealousies, outbursts of wrath, selfish ambitions, dissensions, heresies, envy, murders, drunkenness, revelries, and the like is running away from God and will not enter the Kingdom of Heaven. (Gal 5:19-21)
The flesh lusts after and craves those things.

I believe it’s very clear for someone like Enoch or Noah to “walk with God” means neither committed the lusts of the flesh mentioned in Galatians 5:19-21.
For anyone to truly walk with God, one would need to give up those things too and exhibit love, joy, peace, longsuffering, kindness, goodness, faithfulness, gentleness, and self-control in their life. (Gal 5:22-23)

If we live in the Spirit, let us also walk in the Spirit. Gal 5:25