Be good now...

There are very good, non-theistic reasons for being 'good'. In fact, more than necessary.

As Matt M. explains:

I to – being human – have a number of “immoral” urges. So why don’t I act on them? Hmmm… perhaps because doing so would more than likely leave me friendless, jobless, hunted by the police and wracked by guilt at the misery I’d caused.

At what point does that become attractive?

Immoral acts – i.e. acts which cause pain and/or suffering to others – are attractive only to psychopaths. The rest of us, regardless of our metaphysical beliefs, have plenty of good reasons – internal and external – for avoiding them.

As Stan Lee used to say: nuff said?