The best I can do is offer an analogy: one day when I was roughly 8 years old, my older, teenaged, brothers were misbehaving - generally complaining and being annoying. My mom then told my younger brother and I that we were going to go to the library.
I didn’t want to go to the library. I was playing with my legos (which my parents had bought me, and which was legitimately fun), and pretty happy, and the library sounded pretty boring. So I complained a little bit, and asked to stay home but eventually my mom got us both in the car and we left.
It turns out that “going to the library” actually meant going to taco bell (which was an amazing treat at that age) and then going to the playground behind the library and generally having a great time while my older brothers worked off some of that periodic teenage angst. It was great fun, and after I realized what was going on, I felt like a heel for complaining when my mom told us what we were doing, and apologized.
Saying that we’re happy being an atheist because we want to enjoy our pizza and not feel guilty is rather like refusing to accept the “trip to the library” because we want to play with legos. It’s settling for a less because we don’t truly know what we’re being offered. And as for avoiding guilt - well sometimes we should feel guilty. It motivates us to do what is right. When I complained about going to the library, that was bad, and I did need to apologize - my guilt was deserved.
Or in short, we can get so caught up in the shadow, in the little joys God gives us that we forget that He’s standing right there offering us much, much more. This doesn’t mean that the little joys rival God. It just means that even the little joys are actually big enough to distract us, and that if we don’t stop to remember where they came from we can miss out on the much larger Joy.
Or as my eight year old self learned, Legos are great, but sometimes you have to put them down, even if that seems boring and bad, to see what’s really going and end up with something even better. (It’s funny the things that stick with you. I wonder if my parents suspected that that event would leave such a big impression on me.)