They believe some parts of Christianity but they also have views of God that do not fit with the Christian God. In fact, if you'd ask 1000 religious Bulgarians what God is, you'll likely get 1000 wildly different descriptions(most quite outside of the Christian one).
That would not be much different than virtually any place else. If you ask 1000 (fill in the blank with whatever nationality) what god is you would probably get 1000 different answers.
There is no better love between 2 people than mutual respect for each other WT Young, 2002
Who gave anyone the authority to call me an authority on anything. WT Young, 1969