"Find Jesus"

Well, I'm a lifelong theological conservative Missouri Synod Lutheran who's interned at the Faith-Based Initiative office, studies religion and politics at a tough college, and am currently working at Focus On The Family (yeah, I know), so I'll try to offer a few brief, different views.

evangelism (for some)/marketing (sadly, for most): As has been said, Jesus is more palatable and has been portrayed more often "visually" to the average theological child than Jehovah or the Holy Spirit.

history: The short answer is that while the entire Trinity was stressed by early Church heads (especially to counter, ironically, the Jesus-only folk), those fricking western Europeans ruined it all when using political manuevering to preserve their state versions of Christianity.

politics: It's really easy to exclude the "intolerant" teachings of Jesus. It isn't for Jehovah and the Holy Spirit. When people of all political and religious stripes have to evaluate a program, some of Jesus' stuff is the easiest to sterilize for them.

theological: Jesus' years on Earth are the fulcrum on which the Old and New Covenants, the most important concepts that we can understand now in the Bible, rest.

practical: Since some churches measure success by congregation size/offerings and net baptisms, they take a bare-bones version of absolution to bring in new and old members each week. Justice and sanctification are left by the wayside.

Jam it back in, in the dark.