Hi, can a muslim say christian prayer?

I am christian but I want to become muslim, but I made a promise to God and he helped so I have to say many prayers for him in return, but christian prayers. What do i do? I have to wait before I finish praying all prayers or can i become muslim and still say christian prayers? Thank you very much, friends.
Update: I said i was a christian because i was born one, not because i practice the faith anymore.

I understand that this is probably wrong but I want to be truthful to God, because a promise is a very serious thing and at the same time i'm tired of waiting to become a muslim.
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