Yes sharia banking should be made illegal and it only advances their agenda. It is fine and acceptable to oppose Islam and sharia.
So, should it be illegal for a bank to choose not to charge interest? Should it be illegal for a bank to choose not to charge a high fee? Should it be illegal for a bank to choose not to invest in risky investments?
What if the bank chose to just do this but not call it Sharia? Should those individual practices I mentioned be banned?