> if the world is merely a meaningless coincidence
Life is only meaningless for theists who need to have someone give them meaning.
> No G-d--no morality.
In a word (and appologies to the tender-eared)... that's utter bullshit. You are vastly ignorant of the real world, and I doubt highly that reason woudl reach you. Your bigotry is beyond such things.
> mine rests on a sound theoretical foundation...
A foundation of primitive goat-herd superstition is NOT terribly sound.
And is this meaning "self-evident" to all "rational" people? What happens when "rationalists" disagree among themselves as to what the "meaning" is? What is your argument against other atheists who are Marxist-Leninists? How can you say that their values are objectively "wrong" (and how can they prove the same about yours)?
There is Divine decree and there is utter subjectivism which the strong force on the weak. There is no middle ground.
Judaism/Noachism rests on an objective foundation that no other religion ever has had or ever will have.