19th century Christianity in the Inland Empire, a select portion

On this Good Friday, I was curious and wanted to find out about the oldest Christian church in the Inland Empire. I still haven't found it, so I quit and concentrated on the history of a church I knew - the First United Methodist Church in Upland, California. And although it's not the oldest, it's very old indeed:

Early in 1889, a few members of the Methodist Episcopal Church of Ontario began a mission fellowship among the residents of North Ontario. By 1897, the community was named Upland, and property was obtained on the corner of Euclid Avenue and "C" Street to build a chapel. That chapel was dedicated in June of 1898, with Rev. Dr. Wright as the first pastor. Rev. W.L. Miller was appointed as pastor at the regular conference in 1899.

The cornerstone of the church was laid on June 9, 1905, when the church had a membership of 188.