How to go about quitting?

Hi all! I deleted my post before so don’t mind a repeat.

I work for a small beverage company that’s available nationwide in legacy of the owners son passing away 5-6 years ago. When I first started, I was under the assumption that they want to focus on the products, the juices. But as I got into working for them, their social media brands off their child. His face is the logo, and they want me to market off his story, his values and his religious beliefs.

I don’t know if this is normal but to get their story out or if this even pertains to marketing but they expect me to reach out to celebrities ranging from Taylor Swift to Mark Wahlberg to Adam Sandler to Paris Hilton at the hopes they will shout them out without compensation and post them on social media. All being either celebrities that either he liked before he passed or celebrities that simply align with their faith. at the same time they are shipping out their products to Tesla and to Imagine dragons via Instacart because it’s too expensive to ship drinks. I have explained that they don’t always respond but no matter how much I explain that they won’t respond that I have to be more hopeful and optimistic.

I want to quit because I feel like I am not doing the role i’m being asked, how can I go about this?