I believe this to be false. Obviously Christs death on the cross was the BASIS for our salvation. But Paul never thought anyone would try to segment his teachings like we see today.
How does this doctrine that the cross only saves play out? I suppose that all one must do is believe Christ died on the cross for us.
Paul himself added somethings to this.
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. Romans 10:8-12
Was Paul a heretic? He said we must
CONFESS the Lord Jesus in order to be saved!
He also said we must
CALL ON HIS NAME in order to be saved!