A Christian is a person baptized into the church, (or who would have been baptized, but was not able to receive the sacrament, for whatever reason).
Happy Christians are people who "arrive" every Sunday of the week. Instead of always being on the lookout for the newest and latest spiritual, or evangelical, or religious, or entertainment "high"--they are more than contented by resting their souls in Christ, in His worship, in His church, on His day. At these services, the saint is fed the word of God (via sermons), and he is partaking of the other means of grace, too, by which his faith is built up.
Just as in the Old Testament, the Old Covenant church "ascended" to Jerusalem for worship, (hence, the Psalms of Ascent)--so, in the New Covenant church we do the same thing, on Sundays.
This kind of Christian lifestyle saves believers from having to scurry around all week, hoping to snatch up some crumbs of spiritual food from whatever source they can find: extra services, christian radio and tv, or whatever.
The soul is satisfied. The saint is resting in Jesus. She has laid down her burdens at the cross; and she enjoys the blessed rest of the Sabbath Day. She has quit working for her salvation.
Are you ready to arrive? Try a good church. You'll find Christ there.