Quite simply, I don't like being lied to
I don't believe in gods for the same reason I don't believe in ghosts, gremlins, leprechauns, faeries, unicorns, zombies, vampires, bigfoot, angels, demons, crystals, chakras, chi, dowsing, tarot cards, mediums, psychics, and many other human inventions which have zero scientific evidence to support the claim of their existence
I think that's what most atheists answer would be.
But on the other side,
they would agree that many religious rules are good, for example ten commandments. But they would like to people to follow such rules not because of fear of being damned but because it's right thing to do, because of morality etc.
I would
NOT agree that the ten commandments are good... since you brought it up, lets talk about them:
First, there are at least 3 distinctly different versions of the ten commandments (Moses broke the first set that "god" wrote without naming those commandments at all... the 2 different lists are from Exodus 20:17 and Deuteronomy 5:21)
The Jews (who wrote the ten commandments) believe in a different list of 10 than the Catholics... the Protestants believe in a different list than either the Jews or Catholics... 3 different lists followed by people who claim they are the infallible word of god (a real god would make sure everyone was on the same page, i.e. used the exact same list)
1) Thou shalt have no other gods before me (egotistical, not a complimentary trait for a god)
2) Thou shalt not make idols (why not? who cares? more egotistical nonsense)
3) Thou shalt not take god's name in vain (more ego... wow god's ego is HUGE)
4) Honor the sabbath and keep it holy (more ego?)
5) Honor thy father and mother (sounds ok, but some parents do horrible things to children, like rape them, etc)
6) Thou shalt not kill (FINALLY!!!! A GOOD COMMANDMENT!!!! GO GOD!) (hopefully this second half turns out better than the first half)
7) Thou shalt not commit adultery (does it really matter? this certainly isn't illegal or anything)
8} Thou shalt not steal (a good rule, but not anything new... god/moses/jews were not the first to have a rule against stealing)
9) Thou shalt not covet thy neighbor's wife (thought crimes? not a good idea)
10) Thou shalt not covet thy neighbor's ass (redundant... more thought crimes... why not just combine 9 & 10 into "don't covet anything"?... bad bad bad)
Only 2 of the ten commandments are even good rules, and both of those were illegal for centuries before the Jews came along and gave credit to god for them
And, if they are such amazing commandments, why do the Jews, Catholics, and Protestants all believe in a different set of 10?
https://en.wikipedia.org/wiki/Ten_Commandments#The_Ten_CommandmentsIf god was any good at predicting the future, he would have made commandments like:
"Thou shalt not have sexual relationships with children (talking to you priests)"
or "Thou shalt not own another human being as a slave"