Paul tells us to rightly divide or “correctly partition” the word of God.
From my simple understanding that pertains to the two evangels.
Galatians 2:7-8 states
“But, on the contrary, preceiving that I have been entrusted with the evangel of the Uncircumcision,according as Peter of the Circumcision”
The genitive of the greek is used here. playing music TO the spanish is different than playing music OF the spanish.
I would argue Paul makes it clear that the “secrets” obtained by Him by the risen Christ is NOT the same evangel that is being preached to the circumcision and its proselytes.
Many thing differ between the two. So much that even peter says “they are hard to understand” 2 peter 3:16.
Why would they be “hard to understand” if it was the exact same message He was preaching.
When commissioned to preach the coming kingdom even Christ told His circumcision apostles “do not go on the road to the nations” and during His circumcision earthly ministry said “I have not come but for the lost sheep of israel” (a verse I have hardly yet heard a good explaination for from modern one evangel preachers). Thats because the kingdom message was never given to the gentiles. It was a promise, and a covenant, made to Israel.
In short, Im not the smartest person to talk about this but Im smart enough to see the differences between Paul and the circumcision apostles. Some of which differences outright contradict one another UNLESS they are two different messages dealing with two different people.
From what I understand in laymans terms.
Circumcision=The bride of Christ,Faith+works+plus forgiveness+being many called few chosen,israel must be born again, put on hold till the compliment of the nations come in,chosen left behind upon Christs return,entrance to the 1000 year kingdom.
Uncircumcision=The body of Christ,belief in Christ complete and finished work on the cross,all who were chosen will be called, justified by faith and grace alone, crucified with Christ and is a new creation (prolepsis),is the "compliment of the nations, works for reward of reigning among the celestials but not for eonian salvation itself, chosen snatched away to meet Christ in the air upon His return.
Here are some more,but not all, of the differences between the two:
http://weltmanager.de/wp-content/uploads/2015/06/TheTwoEvangels.html
^THIS IS SUPER IMPORTANT IN MY OPINION. If one says theres only one evangel then what we have is nothing but a book full of contradictions.
I believe mixing the two is the “anathema evangel” which was “not another (circumcision)”
If you wanna get into the nitty gritty