So even though you have no religion or innate moral compass, you still behave in the same way as a good person does as a side effect of your fraudulence. This has been discussed in depth elsewhere.
One of the ways in which you will often find yourself coincidentally choosing the same actions as a genuinely good person would is with lying. And this is because you really suck at it. You suck at it like you suck at managing money or cultivating lasting relationships or not being neurotic. It's a part of you and you've come to accept it and probably work out some ways of getting around it.
But again, it's good to remember that the reason you tell the truth pretty much all the time has nothing to do with any sort of moral duty any more than it's the moral duty of the gazelle to run away from the lion or the priest to take out his repressed sexuality on children -- it's just nature.
So let's say you're asked to go to a party with someone you know pretty well, but you know this party is going to be a seriously torturous ordeal full of inane people with nothing but asinine and uninteresting stories to tell about other horrible people who you don't know but must be pretty horrible to have participated in the events of this story. You can't lie to get out of going to this party, so you will either:
a) be honest and risk a confrontation with your friend about why you refuse to do this one thing after all the many things this friend has done for you and that these people aren't that bad and you are a selfish prick
or
b) you don't say anything and you just go to the party and steep yourself in misery and resentment
See, if you do b), on the outside, you haven't lied AND you performed this self-sacrificial act, seemingly for the benefit of your dear friend. But really, what everyone else doesn't know is that you only didn't lie and say you were busy because you are a failure even when it comes to lying, and also that you sacrificed yourself to go to this party not out of some sense of duty or ethical obligation, but just because it's your first instinct when put in a bad situation. Like a mother throwing herself in front of a bus to push her child out of the way. Except in this situation it's as though what moves the mother to do that is not the instinct to protect her child but rather that she has some severe and dramatic motor skills problem.
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