You did not understand what I wrote. I could restate part of the question as "How do you know you actually believe anything?" but language is ambiguous and the idea is complex so who knows if you get my point.
Or even three questions: "do you know what belief is?" followed by "do you understand what 'Jesus is Lord' means?" Followed by "do you have that belief?" but even that's extremely vague.
Anyway Parables are a great way for someone to completely miss the point while thinking they understand what you area saying. It's possible that God does not care about the minor details (and it's a reasonable argument to make), however that's also a massive assumption. (Both in how God feels and what's minor.) (EX: "Is eating specific things at specific times important or minor?" is really two question "is it minor?" and "Is it important?")
PS: My point is simply one of clarity. It's easy to shape what you read/hear/see to fit your prior assumptions, but be careful when you assume you completely understand a given sentence let alone a book and or things of importance.