Lyric discussion by LuvMartinGore 

Cover art for Judas lyrics by Depeche Mode

I think that Martin is drawing a parallel between the love of a partner in a relationship and the love for a god/higher being. People are willing to give up all, do anything for, even die for their god, just as people are willing to do the same for someone that they truly love.It's also about proving how much you love someone. If you can do these things for a being that you've never seen, then you can do the same for your significant other.