AND!!! Our differences can be used against us so easily. When I was young, in the 1950s, going to school I remember hearing that the Native Americans were a Godless race, so He gave North America from them. The murder of millions of the indigenous population was pawned off as God's will. Thankfully, the church is not in Public schools any longer.
Life that we know of here on Earth is Carbon based. What will we do when we encounter life based on something else? James White, a Science Fiction writer wrote several books on the subject in his "Hospital" series.