Kids and adults alike frequently feel conspicuous and out of place in a strange congregation. My husband and I have struggled with this ourselves for years, and I have a few suggestions that may work for your family. Consider using the Sunday morning worship service as an educational opportunity. Try attending a congregation that worships in a style different from your own, even a denomination that you are unfamiliar with. If you're a Protestant, visit a Catholic church for a change, or a congregation of a different ethnic background.
Most churches welcome visitors of all backgrounds.
My husband frequently relates his enjoyable experience in a Chinese bi-lingual Protestant church while in Chicago. He was warmly welcomed and was even invited to stay for a potluck supper afterwards, which he described as a great Chinese buffet. You can also consider visiting a service in a historic church, or in a church which offers something unusual in the way of fine arts. While in Europe we visited a number of services where we couldn't understand the language, but we took in the beauty of the cathedrals and the exquisite music. Adults as well as older children will be struck with the fact that our Christian family stretches all over the globe, encompassing many languages and cultures.