Madhatter, religion is not a necessity for using magic. You can -- and should -- follow whichever you choose. If you want to continue as a Christian, then by all means do so! If you choose to believe in one of the multitudinous pagan religions, that is completely HP to you. Don't let fear hold you back from experiencing life!
As far as magic, what tradition or method you follow is also up to you. Chaos magic is interesting. Some people treat it very differently than others. Chaotes will draw from many very different sources, combining ideas. Some people never get beyond sigils and law of attraction type stuff, and many dabblers treat it as an attempt to attract more money into their lives. Others take it much farther, and take it also as an opportunity to study many different magic traditions and mythologies.
But really, just follow whichever tradition seems right to you. There's nothing wrong with changing at any time.