Ahh, Your rendering a product on just a page as a collection. May I ask why your trying to do that? Why are you not using the product eCommerce layouts.
Doing what your doing you will only ever display information. You will never be able to do grouping, attributes or anything like that because they are more then just data output, they have functionality, BC script features and more to run off.
Unless you 100% know how and you had all the info available (which you dont yet) to completely replicate every BC script feature etc - You will not be able to do what your doing.
Liquid runs in layouts, just use product layouts and do things in there. I not seen on that page any reason why you would not be.