The "belief" we're in a simulation is more like a interesting idea than something people organize their lives around. Is it possible? Yes. Am I going to praise the great programmer every Sunday? No.
The belief in God in most cases is not just belief in some general higher power but a very specific deity with weird morality, silly mythology and bunch of scam artists behind it.
- I think there's a higher power...
- Ok...
- that got mad at us for eating fruits but then impregnated a lady with itself and pissed us off so that we murdered him and he could say he's not mad anymore.
- ... WTF?