What Is The One Step Of One Step Doctrine?

[Michael The Disciple]

Is there just one step to salvation? Believers say there is. Does it hold up under their own belief system?

Here is the meat of this belief.

8: But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach;
9: That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
10: For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
11: For the scripture saith, Whosoever believeth on him shall not be ashamed.
12: For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.
13: For whosoever shall call upon the name of the Lord shall be saved.

Which is the one step one must take to be saved?

Is it to believe in the heart?
Is it to confess with your mouth?
Is it to call on the name of the Lord?