As @chamathme mentioned, you are not able to select a product page and make it your home page through the theme editor. However, other than custom coding, you may have some other options depending on what you are trying to achieve.
The following are a few questions so I can help make some suggestions:
Home pages are an important landing page for your customer; they are an opportunity to introduce your brand, and make a strong first impression. The header - the first section a visitor sees on your home page - is typically combination of an attention-grabbing headline, persuasive subtitle, and captivating visual to help keep new visitors on your site. I recommend making sure that removing the home page is the right decision for your brand, and business. There is more about home page design in our blog if you are interested in learning more.
If, for example, you are a one product store, this could be a good use of featuring a sole product on your home page. Since visitors who land here are expecting to find only one product. Below are some examples of themes optimized for selling one product:
Other options for featuring products on the home page are available through sections, which are used to build your home page. Depending on the theme you select, different sections will be available. Once I know the theme you are using, and the number of products, I can help make some section recommendations.
Lastly, as mentioned by chamathme, you could achieve this through custom coding. If you need further assistance with custom coding outside of the Community, you can always hire a Shopify Expert.