Ask how many sacraments they practice.
The differences will start to become obvious.
well, we had baptism (infant–sprinkle), confirmation,
communion (once quarter–had homemade wine and bread, somtimes oyster crackers–taken in small individual cups/pieces from a tray and consumed as it was passed around, no intinction),
marriage
and ordination (no celibacy, of course, and I never heard of a contemplative order).
This was in the 1960s and 70s. I honestly don’t know which group we would have been affiliated with, PCA or PC(USA) and the church itself no longer exists (it was too small to sustain itself), but the church that it eventually melded into is PCA, so I suspect it would have been PCA (the one my father has returned to is PCA). The other churches with which we had our youth group are PC(USA) now (and one ARP church).
No kneeling, just standing and sitting reverently and quietly, children in the full service from about age 5, before that in the nursery which had the service piped in.
The church itself was very plain, about the early to mid 70s, we did add in Chrismon trees at Christmas in the sanctuary. Other than that it was a couple of candles on the communion table which stood in front of the pulpit. When I did confirmation, mid 70s, I had to study with the minister for a month and be examined by the Board of Elders to be sure my confirmation was acceptable. Catechism is very important. I got $1for memorizing the children’s catechism when I was 5–
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We did the Apostle’s Creed and Lord’s Prayer every service. For years as a child I could recite the Creed flawlessly in church, but needed the physical trigger of the environment, as outside I couldn’t remember all of it.
We had service (hour of Sunday School followed by the hour of preaching service) on Sunday mornings, usually Bible study and youth group on Sunday evenings (another hour or two), Bible study, dinner and choir practice on Wednesday nights (2 hours), then once a year there would be a week of Revival (about 2 hour services every evening with visiting minister) and Vacation Bible School (about an hour and a half each evening for a week for children of activities and Bible study–not at the same time as Revival). Sunday night and Wednesday night activities were usually just during the school year.
My family’s personal practice included the above plus a daily hour of devotions which started with prayer, had Bible readings and a sermon from my dad, then we knelt and prayed aloud in ascending order of age about all the things we had done wrong that day. This was 7 days a week until I was 10, when he allowed that since we had been at church for close to 4 hours on Sunday we could skip everything but the prayers.