In my opinion, when you begin teaching outlandish ideas that take you to other planets as Mormon ideology does, it tends to discredit the history of the faith which is at the center of the sect. When modern day people begin to add to the Bible and their motives are questionable with regard to the ancient scriptures and Judea /Christian tenants, then you have moved away from the Gospel and Truth.
I also think it is a little out of reality to think that the mission is more important than the message or that the sabbath observance negates the saving power of the cross. Jesus said that the sabbath was made for man and man was not created for the sabbath. This means that man's salvation through him is first and then comes the worship of the creator and the resting of man to celebrate the relationship with the Trinity. When the old laws and rituals cause a person to move away from the life, death and resurrection of the Gospel...then they are not beneficial to the Christian believer.
However; our Christian faith is rooted in Judaism and the Jewish faith of our Lord and God, should therefore be grafted into our Christian religious culture and our acceptance of the ties that bind us.
