I despair, I really do. If this is what the debate on living a good Christian life has come to, it is absolutely no surprise at all that secularism is winning hands down in today's world.
Flat earthers, you really must stop, wake up and smell the coffee (or is the smell of coffee a conspiracy too?). Consider an adolescent trying for the first time to choose a philosophy by which to live. If they saw the posts on here purporting to be from 'Christians', of course they're going to run a mile in the opposite direction.
The canons of Christianity are really very simple: Love God, and love your neighbour as yourself. With your ridiculous arguments you're doing the Catholic church a major disservice. Maybe that is really your objective? Are you in reality agents provocateur tasked with making the Church look ridiculous from within, and pushing it towards destruction? I've said it before, and I'll say it again - shame on you.
When you face your final judgement, and are asked 'what did you do to spread the message of Jesus Christ throughout the world?' do you honestly think that replying that you spent your time and energy trying to refute the fact that the earth is a globe is going to endear you to your creator? If that were me, I would be trembling in fear much more than I am already for my sinful ways.