Ideally, that sounds like a good plan. If you were able to actually do that, great. I can't imagine that, given your experience with Christianity, though, you could do a very good job at presenting your daughters with an "unbiased" view of Christianity. Also, given the fact that there are some 30,000 different Christian denominations in the world today, you could hardly do more than scratch the surface. I just know that Mormonism (whose members very definitely consider themselves to be Christians) have next to nothing in common with the group in that video you commented on. I shudder to think that my beliefs might be lumped in with those of the Christian faith you knew as a child. Also, I think it's really almost impossible to really explain something you don't have any more than a superficial understanding of yourself. If I were to try to explain Islam to a child (or teenager), I would do my darndest to be objective and thorough. I've got to admit, though, that I would probably do a lousy job. I think that to be able to make a choice as to which religion to follow, he has to be able to hear its doctrines taught by an adherent of the religion and to ask as many questions about it as he can think of.
I personally liked the way my parents raised me. I was taken to church every week and given religious instruction in my own church's beliefs. But, I was never, ever threatened and I was always encouraged to ask questions and express any doubts I might have. I remember having an interest in other religions than my own by the time I was ten or twelve, and being encouraged to find out about them.