You may not know this and it would be hard to tell with what is left to the OT but once upon a time the OT was written by those who believed in Jesus Christ.
You said: The Bible is the writings of Christian...
I bet the Jews would surprised to learn that the OT writings were penned by Christians.
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The fragments of the ordinance and of the coming and Lord Jesus Christ can be found in the OT if one studies the OT carefully with the help of the Holy Spirit.
Isaiah talks about it a lot and so does other scriptures.
By reading the Book of Mormon one is able to discover those things when they read certain passage of the OT.
It is truly a Joy to witness those nuggets that have been lying dorment for centuries!
Out of respect... no comment.