"For I will not speak of thy mysteries to thine enemies" has guided me on this a lot in the last year.In my humble opinion you should not engage in theological debates with heathens and athiests. A religious objection is simply that. You are not obligated to explain yourself. They don't get to ask for your sources. Who are they to question your relationship with God? Of course it may not play out that way in reality because they have all the power but you're just playing into their game if you go that route, imho.