Brides.com:
According to recent trend surveys on Japanese wedding sites, Western or Christian-style weddings make up about 50 percent of ceremonies
Only 2% of Japanese are Christians but half of the Japanese get married in a faked church. They don't believe in Jesus but they like the church marriage rituals.In the case of a Western-style wedding, the officiant and venue are often set to resemble a priest and church, though unless the couple is Christian (around two percent of Japan's population is), these are likely to be facsimiles.