Well...again, don't see the need. The last church we attended had just that...and I must say it was not joking around...the children learning catechism and memorized verses. Our 7 yr. old has much of God's Word hidden in her heart and her 5 yr. old brother is fast on her heels, for that we're thankful. The 7 yr. old came to us when she was but 4 and because of a S.S. lesson about Joseph told us she knew she has sins in her heart and she wanted to know how to get rid of them...Praise God. We've seen fruit in her ever since, and before then...so praise God for His Word. But having said that, I don't believe you have to put them in separate classes. I was in the littlest' class, so I guess I never really let them go on their own anyway. We've not had bad experiences as I've heard some have, but we just think that they can hear God's Word just like we're hearing it and God doesn't use another Word d to save them...the same Word that quickens the adult can quicken them also!!
Deuteronomy 31:12 - 13 Gather the people together, men, and women, and children, and thy stranger that is within thy gates, that they may hear, and that they may learn, and fear the LORD your God, and observe to do all the words of this law: 13And that their children, which have not known any thing, may hear, and learn to fear the LORD your God, as long as ye live in the land whither ye go over Jordan to possess it.
Even when Jesus fed the multitudes, men, women and children were present.
Just our preference maybe, but this is the way we like it! You'd be amazed what children can learn if you think they are entitled to the Word of God just as much as the adults.
Besides, what about the adults who are missing the adult class while you're in there benefiting from the teaching?
I could tell you stories about what some S.S. teachers weren't even aware of. But like I said, this is where my husband and I stand on the issue. Don't see the need to separate our children from us.