I suggest you read what he actually said in Galatians 1 and 2 properly.
After the agreement made with James Cephas and John in
Galatians 2:7-9, Paul was writing to gentiles in the Body of Christ in chapters 1 and 2
Let's really read the words carefully to understand what Paul is really saying, notice the unto 3 three times?
Galatians 1:8-9
8 But though we, or an angel from heaven, preach any other gospel
unto you than that which we have preached
unto you, let him be accursed.
9 As we said before, so say I now again, if any man preach any other gospel
unto you than that
ye have received, let him be accursed.
Paul is actually saying
if the gentiles are preached another gospel other than the one what
they are receiving from Paul, let the preacher be accused.
Can you see you are misinterpreting it to mean "Paul also said if anyone preach any other Gospel, let him be accursed"?
We have probably exchanged this a number of times, you have already decided your doctrine, then you basically prefer to read it into scripture, without actually reading it.