You only need one reason to believe.
Hardly! Belief needs no reason whatsoever. It is just an esthetical inclination.
I use cause and effect.
Wrong verb, but whatever. I have no reason and less inclination to care about your reasons for belief in god and afterlife. I hope you do not expect me to.
Would like to hear your 'good' reason for disbelief.
The idea of a creator god is ludicrous. That is really reason aplenty.
But if you want something less personal (and frankly, that is quite unnecessary and pointless), a creator god would leave less chaotic an indication of his existence, if he wanted to be perceived at all.
But if you mean your specific variety of beliefs, which tend to gravitate quite decisively towards some odd expectations of some sort of choice involving a destiny in an eternal afterlife...
... well, I am just not the kind of person who cares about those matters. It would make no sense for me to lose any time on that.
If you want to know, I feel a bit guilty about perhaps giving you the impression that I might care. It feels disrespectful towards you that I might.
The bottom line is: I do not worry about an afterlife. I feel no need, I have no duty and no reason to even consider the idea.
And if that troubles or inconveniences you in some mysterious way, too bad.