This is an interesting question. We are a pragmatic bunch who naturally want to live but know we are dealing with a gun wielding fanatic. We know there is no reasoning with him so it's best just to humour him.

I put live. Some things are worth dieing for though.

I'd tell whatever lie the crazy person with the gun wanted to hear to get them to go away.

One the person with the gun is gone, I'd go back to non-belief again... not that I'd have ever really believed to begin with.

Living for sure

I would convert, but behind my back l would have my fingers crossed. ?

I would lie to live.

I'd lie like a televangelist!

Many of us have had to openly pretend for some spans of our lives anyways, so I'd probably default to live first.

However, I could see a situation where I would be like Socrates when there may be a more important purpose to me dying.

Also, it could be a good chance to openly illustrate how bad religion can be... although I'd hate to have to be the one under the gun to do so.

Yep

in this case they don't really care if you actually believe or not. One can not be forced to believe what they know not to be true. They in this case only want you to pretend to believe what you do not believe. So to live I would simply put on a good show.