In your debates and arguments, remember to be polite and reasonable.
It is easy to think that the natural course of a debate or argument is to become loud and angry. If this happens, you will be very unlikely to convince someone to adopt an alternative position - even if you are perfectly reasonable and right in your position.
Instead, we are called to be patient and gentle (though gentle does not mean you can't be firm). It is God who will grant repentance, if that is to come. A person will not "get it" unless His Spirit acts on them to open their eyes. And again.