Meditation is fundamental in Buddhism. To practise Meditation adopting a belief system is not necessary. Neither is that so with Tai Chi training even though one of my students 20 years ago told me that he couldn't keep doing TaiChi after he became a 'born again' Christian because his preacher said that TaiChi was the work of the devil. I wonder about what Jesus would think about what people have said & done in his name since he walked the earth. Especially since a lot of what he taught was Buddhist, Hindu doctrine anyhow & quite different to the god of wrath stuff of the Jews. After all he did go into the desert to pray. Was he doing meditation or was he praying? That is a interesting question. Is prayer to the Christian is a different act & idea to what it is to a Moslem, Jew, Buddhist?

Try this site for some insight.

http://buddhism.about.com/library/blbudmed.htm?nl=1