Earlier quoted context omitted.
The differences between those 'last few prophets' are major. You could say the same thing about Mormonism. Further, Jews, Muslims, and Christians are not monoliths in and of themselves. There are vast divides within those groups. I do wish we would all get along better though. Despite the differences between the various Abrahamic faiths, we have far similar values with each other than with atheists.
we have far similar values with each other than with atheists. I would describe the values of the altruistic modern atheism of people I know, which has a lot in common with Christianity and Judaism at the big picture level, as "be good, do good." One needn't believe in God or gods to believe in good.
Sure there are atheists who are altruistic. But fundamentally there is little common ground, because an atheist does not believe in a divine being who is the source of all morality.
The question I would ask an atheist is: what is good and who defines it?