My parents were Presbyterian missionaries. They worked closely with all the other denominations. The SDA's and Catholics (I had/have good friends from both) maintained their own services, the rest founded the Church Of Christ in Thailand and shared 1 english speaking service where they preached the word of God and stayed away from the differances. Who are we to judge. I grew up nondenominational and worship in the church I feel speaks to me.
Not many people know that Buddha never proclaimed to be a God, just a profit. And was discussed the coming of Christ. Like many religions/denominations, Budisim was corrupted by the state. The High budist priests were easier to convert than the layman because they had read/read the old budist teachings. You will find honest people and hippocrits in all walks of life. I like the saying, " Show me your faith by your works, not your words". Talk is cheap. Words can cut worse than a double edge sword.