That’s quite silly. If a conservative believes that General Lee’s statue should not be removed from Lee Park, and attends the rally for that reason — the Antifa will not make distinctions whether you are in fact a White Nationalist or a classical conservative. You will get hit with the fire extinguisher (see a few posts below this one which links the Joey Salads video going undercover into the Antifa).
The Antifa are anarchists and they are a destructive mob. They will not reason with you that you are a reasonable person. Once they’ve gotten more power, you will not be be even given a chance to explain your “Christian moral foundation”. If you need proof, go to a Trump rally where there is the Antifa, and try to reason with them. But watch out for the bicycle lock and the fire extinguisher.
Antifa will attack you regardless. But do not get in bed with “white nationalists”. You are taking the bait.