Went to church as a kid. The easiest way to achieve this goal is just to go and do whatever other people are doing. If it sounds too scary, bring a friend. Or go to sermons during big holidays, it’s sort of a church open day, and there will be shitloads of people, allowing you to blend in with the crowd. If you are going for a sermon, get some kind of a handbook with the words to hymns/explaining the structure of the sermon to keep you occupied and in order to understand what’s going on.