Well, yeah, Erik the Red and Lief Erikson (Erik's son) and community were Christian - even when they were "over here" - in Greenland 1,000 years ago. (It was warmer up there then, then after about 30 years, it had gotten colder and they abandoned the community.
it got warmer again about 1500-1600 and then got colder again. nature doing her thing. (Don't' tell Gore)