Why would god create the world, and us, but tell us to reject the world and our fleshly bodies?

I’ve recently come to Christ from atheism, but have not yet converted. I have a lot of doubts when reading scripture. The books of the Bible were written by man, who is fallible, so although they may be inspired by god, I feel like a lot of it must be disingenuous. I also think there are many misinterpretations. My question is why would god create the world and humans, then tell us to crucify the flesh, deny our passions, and be in the world not of the world? I came to this question because I heard someone say that priests are not supposed to be naked to prevent shame and dishonor? But if god made us naked, why is it dishonorable? This just led to more questions. Sorry if this is a silly inquiry, I’m just new to this and still questioning a lot of things. TYA and God bless 🙏🏼