Here are your exact words, in which 'punishment' is in the very first sentence; atonement isn't even mentioned.
Arminians insist that Jesus took the punishment for all sins. Yet, they admit that there are people in hell because of their sins. This makes God disingenuous because He punishes people for sins that His Son already paid for.
You say, and I quote, "Jesus took the punishment for all sins". What punishment do the Arminians insist Jesus took?
If you don't know the subject you are portraying, why even start a thread on it? Also, if you don't know the 'punishment' you push upon Arminians, you accuse Arminians of something which could be false.
So, let's have it, what 'punishment' do the Arminians insist Jesus paid for all sins?