You could dismiss local pastor off with this statement:
"I have no interest in making an argument with a person unable to distinguish the mythology from reality, nor I am in mood to listen your baseless claims. I am man of logic, so if you present empirical evidence in the existence of your god, then I'll listen."
If pastor brought the word of "faith" into debate, then you'll have to remind him that faith and logic is mutually excessive.
"I have no interest in making an argument with a person unable to distinguish the mythology from reality, nor I am in mood to listen your baseless claims. I am man of logic, so if you present empirical evidence in the existence of your god, then I'll listen."
If pastor brought the word of "faith" into debate, then you'll have to remind him that faith and logic is mutually excessive.