What is the difference between orthodox church and the Christian church?

The main difference between Orthodox chruch and Christian church is that the orthodox chruch believe they would go to heaven if they do the ten commandments but that was in Old Testament. Jesus Christ came, died for our sins, and changed that. In the New Testament, it is written that we shall get in heaven if we believe and get baptized in the name of Lord Jesus Christ. It is written in the bible that work without faith is nothing. And doing all the ten commandments is good but work without believing is nothing.