Debunking Old Testament ONLY Believers

People who only believe in the old testament are selling themselves short because they fail to see Gods salvation concealed in the old testament but revealed in the New Testament thru the blood of the Messiah as atonement for our sins to be forgiven of the curse of the law. Lets break it down to the basics and get some understanding because this is a dangerous position for anyone to be in because they don't believe in the Messiah will lead you to eternal damnation.