'Love' is a word with a myriad interpretations. If one uses it in the widest possible sense, it signifies (IMO) goodwill towards all humankind, an attitude of kindliness and sympathy, understanding and a desire to help and promote the happiness of others. That's a tall order, but not confined to any particular religion, or to atheism either. With regard to the scathing attitude of religious people toward non-believers, that occurs also between religions. I've been on the receiving end of some quite nasty comments from fundamentalist Muslims because I haven't 'converted' to Islam to match my husband. I've also had one or two veiled hints that 'it would be nice if my hubby were to become a Christian' from a woman at my church. If only people would be content to believe or not and stay out of the faces of other folk. We manage beautifully within our very happy marriage to each mind our own business religiously!