Thanks for the thoughtful and respectful comments, I hope my answer manages to stay in that spirit, too.
> I think the same is true for Christianity too
Disagree, concerning the Abrahamic religions, as what is good is rarely original, and what is original is rarely good:
1. What is good (golden rule, some of the 10 commandments) is not very original. The golden rule has appeared in ancient Greece (Thales), China (Confucius), etc. half a millennium before Christianity, and other places independently. By contrast, Stoa and Buddhism were, I'd venture, among the first to arrive at and codify certain substantial insights that constitute large parts of their teachings.
2. What is original is mostly fairly absurd, if looked at dispassionately. If you strip Christianity of the superstitions, its essence is basically gone.
Just as a small example: it is still current position of the Catholic Church that the eucharist is actual transformation in substance of wine and bread into actual blood and flesh of Christ. (There was a (possibly apocryphal) case in Germany of a vegetarian asking whether he could participate in the communion, and he was told that he could not as a vegetarian, because it IS flesh.) If you erroneously believe that it's purely symbolic, you'd be subject to the punishment of anathema (which is worse than excommunication), if the Church were consistent with its teachings.
> religions offered a way of life that attempted to reduce violence, illness and suffering.
Yes, at the time. But not today.
> what would you speculate if you didn't have the knowledge of how the universe, the planets and life, including us, developed? In that case, a creator provides the fewest assumptions.
Yes, at the time. But not today.
In that sense, Stoa and Buddhism have aged better than the Abrahamic religions, maybe because they were more empiric.