Very good question. In fact one of the very few good rational questions religious people can ask is this one.
So here is the answer. First, the position atheists take are not the best one. (Yes surprisingly).
The most scientific approach is to accept that WE DO NOT KNOW what happens after death.
Now the response to the question more directly. If, there is indeed a
God that is infinitely merciful towards us, he should after all
understand the position a non-religious person takes. The non-relgious
person is relying on his intellectual capabilities, his sincerity and
honesty in understanding the world presented before him. The most clear
abilities we human have is not our mystic psychic abilities but our
clear capacity to conjecture, question, experiment and understanding
capacities. Knowledge in science is never private and always open to all
at the same level. Do we also have supernatural capacities that are not
obvious? Who knows, we may have it. But that is shrouded in doubt to be
very least. So as a simple human being I have really two options to
guide my path. One is to rely simple well understood (god-given)
abilities to understand the world or to forgo it and rely on faith that
is cloudy and not at all well explained.
To me, it is then, overwhelmingly more probable that, if I were a god, I
would love and appreciate those creatures of mine that followed the
simple, logical and clear path. And I would find little virtue in faith
and such things. Clearly because, I did give him the capabilities to
reason things. And I also made the world in a way that validates the
existence of reason very very very well. So, accepting science is
accepting God in the most honest and graceful way possible.
Now, even if the science were to lead my creation to incorrect
conclusions, I would still prefer it by a big margin, simply because the
effort is so pure and honest. A student who tries his best to come up
with an answer logically and fails is much more honorable to one who
simply guesses and gets it right.
If I as a tiny insignificant human can be kind enough to understand this
simple principle, then the real God should pose no danger at all to the
rational minds. A rational mind is an open mind. A mind enlightened by
not cloudy ideas and faith, but knowledge obtained through hard work and
honesty. So God will love it.
And the final point is, if the God is indeed the kind that I hope to be,
then He might actually punish the ones that did choose the path of
believing in things that he did not make obvious. And moreover there are
so many religions to choose from. How can tell with any degree of
authority that hiduism is better than chrisitianity for example (without
lack of generality)? So the pascals wager (google it) can backfire too.
You dont know if you are the ones that are making God unhappy as well.
And that God could be a God of a different religion as well.
So, a chrisitian or muslim or whover, is in no better position to hope
for better time after death. As a matter of fact a rational person has
all the more chance he made the right choice in the eye of God.