That's true, most Christians still thought the earth was flat back then. They hadn't yet reached the same conclusions that some (many?) of the Native Americans had...
Some of the "heathen" groups in Europe are also believed to have reached the "round earth" conclusion quite early as well. Thier attention to the stars, planets, and moon helped them reach that conclusion.
Galileo- how did he fall from favor in the eyes of the church (and end up imprisoned?)? Wasn't it by claiming the earth was round, and that it orbited the sun, rather than the other way around? Why were Christians so reluctant to accept the "round earth" theories, especially if the bible told them the earth was round?
In Galileo's time, the roundness wasn't really the issue -- it was whether the earth revolved around the sun, or the reverse. The trouble was that the
organized bureacracy of the church had thrown its lot in with Aristotle's view of science, and had found some Biblical quotations to back Aristotle up. On the other hand, Augustine (a "church father" who lived hundreds of years before) felt that the passages in question were best viewed as poetic imagery, especially since they were in songs (recorded as psalms). The Pope's official position was that the favored doctrine should not be discarded without solid objective proof to the contrary, but Galileo was felt to have ignored that restriction and pushed his views before the proof was in hand.
But that story is just an example of a bigger issue. The absolutely central, core essence of Christianity is that people start out flawed and selfish -- but through Jesus' sacrifice they can be both forgiven, and gradually regenerated into something new and different. That means
guaranteed people who call themselves followers of Christ are going to be messed up to one degree or another -- we're all going to be
in the process of growing more like the one we follow. I believe when it says we are made "in his image" that includes the ability to freely choose, even though it hurts him to see us ignore his way of life. And so -- there WILL be times we're a bit embarrassing to the boss!
What's absolutely unbelievable is that He loves us at all, given how we Christians behave...individually and collectively.
That's what we call Grace -- the totally unwarranted, undeserved, overwhelmingly incomprehensible love and forgiveness of God through what Jesus did. Unfortunately its way too easy for followers to get stalled out in their growth, to become comfortable and self satisfied. And that stalling out is what gives Christianity (the structured religion) a bad name that Christianity (the actual "Way" of following Jesus' footsteps day by day) doesn't deserve.
History...the news...and our neighborhoods!...are full of people who call themselves Christians but who show self righteousness, arrogance, hatred, and bigotry that have absolutely nothing to do with Jesus. Galileo's case falls under that umbrella, IMHO.