People have been trying that since the dawn of humanity. They always ended up killing each other. We are not a peaceful specie. Aliens need to know that and take precautions or simply exterminate us before we eat their envoys.
Until fundamental changes in attitude arose and began to spread in parts of Europe in the 1600's.
Before that, nearly everyone on Earth was religious, racist, bigoted, misogynist, and fundamentally superstitious. In only 4 centuries, more than half the world population has rejected the divine right of kings and accepted the wisdom and utility of secular democracy, along with a belief in fundamental human rights for all, including women and minorities.
Atheists went from almost nonexistent to a significant percentage of populations in many parts of the world. Studies show 7-10% for committed atheists, with perhaps 2-3 times that for people who claim a religious affiliation yet neither practice nor believe in its teachings.
Follow that curve forward into the future and it's plausible that rationality and reason, combined with compassion and a universal sense of justice will supplant our species history of superstitious nonsense during this century.