I think you have wrong imagination about witches who practice Christian channels. All East Europe including such countries as Bulgaria, Romania, Ukraine, Russia have their traditional witchcraft that called Christian. They call themself as white witches, but calling themself white it doesnt mean they are good or pretend to be so, they are able to do all things just using church as the place for magic.In my personal opinion Christian Wicca is for folks who want their cake and eat it too. These are people who have too much guilt and/or fear to seperate the two. How can you honor the horned God and in the next breath shirk away from the Devil? As far as honoring the Goddess, Mary has revered...and I am glad that she is finally becoming more important in some churches. But immaculate conception? think about it...if she had told Joseph that she had either been raped or laid with another man...they would have stoned her to death...would you speak up? Hell no.
Alina, keep your studies up on the Goddesses that call to you, no one can prevent worship in your mind. Brightest Blessings to you, Firebird
For example simple ritual, you buy a candle and lit it for health of your enemy, but put it up side down... next day your enemy will be sick. if you are white witch you know what words to say and which ikon to channel this candle through, so your enemy will get paralised.
If you go to greek or russian church and you see people in middle of church under church dome reading prays or psalm... they are not just reading, they do spell casting

By the way Catholic version of Psaltyr is different to Orthodox or in Hebrew. Catholics excluded most dangerous parts and banned from usage.