The Church of Jesus Christ of Latter-day Saints

This building serves three congregations («wards») — instead of one big congregation where someone gets lost in the shuffle, clearly the intent is to facilitate a more personal experience.
Family friendly — lots of kids. Uplifting, spiritual experience. Great place to come and worship the Savior, and to learn more about Him. Lots of friendly faces. Lots of Sunday School options for kids, from 18 months to 18 years. Good youth activities during the week. Stimulating discussion in the adult classes. Services start at 9 am, 11 am, or 1 pm — depending on the congregation you choose to attend. Format is fairly standard across all three congregations.
I’ve been attending the Lake St Louis Ward for about six months, and my family and I have felt very welcome. The ward has helped us each get closer to the Savior.