The caption in this photo and in the one of the five pastors includes a phrase like "independence memorial." Yawata Baptist Church became self-supporting in 1924, meaning they no longer were dependent upon mission funds. I am positive this it was this "independence" is referring to. The church was celebrating the fact that they had become financially independent, and they made up these photo postcards as part of the celebration.
--
Yawata Baptist Church

Yawata Baptist Church exterior (different angle from the shot in the previous photo), and interior (which is the same as the next photo, but a close-up and different angle of the pulpit and vase).