I would respond to the beginning of your post.
Personally, I think that we do not need to UNDERSTAND to be Christian, and that there is no "fully" and "not-so fully" Christians.
If we accept Jesus as Lord and Savior and believe that He rose from the dead, then we are fully Christians.
I liked the statement form one of Bishop Wright's sermons,
The way I look at it, he said, is this: if God raised Jesus Christ from the dead, all the rest is basically rocknroll.
MKJ, are you saying we cannot be truly Christian until we understand
We don't need to understand everything Christian, but we must believe it anyway.