There are wonderful meditation retreats/opportunities in Bali, especially as you go farther north. Most of these places are run by Buddhist monks therefore they do not judge or try to convert you. You can be of just about any faith and welcomed there as well as comfortable. (As long as YOU dont try to push yr personal beliefs on others) If you choose to participate in meditation workshops you will learn incredible techniques that will enhance whatever Christian beliefs you have, afterall the Buddhists invented meditation so where better could you go? As a Presbytarian I try to also follow the teachings & principals of Bhuddists as they do not conflict and have made me a better person. You can be assured a beautiful, serene, safe place with healthy food, wonderfully open and happy (masters) teachers with great classes & yoga. I can think of no better place to quiet your mind, nurture yr body & renew yr spirit! over 8 years ago
There is a Christian church in Palasari (South West) where there is a fairly large Catholic Community and I'm not sure if they hold retreats or not.
The village is well kept and the church is a lovely old white bricked building amongst palm trees and rice fields, and there is a beautiful resort close by on the lake (Taman Wana Village) - however I was there in March 2012 and the resort seemed deserted.
There is also Protestant Church in nearby Belimbingsari. about 8 years ago