I think if he is being a dick about it then he is being a dick.
There are for example, lots of things in the bible I disagree with. But it was written in a different time and had had years of men changing things. So I take gospel as...very rough guidelines that may be outdated...not actual gospel lol. And I don't have time for people who assume that God isn't capable of growth and changing with the times over thousands of years, just like we are. I try to do what feels right in my conscience.
Also bare in mind that many people use religion for their own controlling and manipulative ends.
If in doubt, ask yourself if the person is a nice human being or not. If they have good intentions for the world or if they are infact just self involved and looking for validation that they are somehow better than others.
Just because someone claims to have sudden found religion, does not mean that they carry God or love for their fellow man in their hearts.