I think you misunderstand the point. I'm not talking about a correct interpretation of anything. It's a pretty common understanding that the Abrahamic religions all share the same deity and only differ in their interpretation of the texts. There's in fact a passage in the Quran that directly states that worshippers of Islam and Christianity worship the same god.    


But if you're not even capable of withholding your bias to even discuss the possibility then there's no point discussing it as that makes for a pretty boring conversation.