If the earth were a sphere with all of the evidence pointing to this conclusion I would believe it were a sphere. But this is not the case.
OK. here's some evidence pointing to the earth being a sphere:
Ships lowering over the horizon.
Rotation of the night sky around points at the north and south poles.
Pictures from craft in space showing earth as a ball like object.
The sun and moon sinking gradually over the horizon when setting/rising.
Lunar and solar eclipses, and observed effects therein.
Now here's the key thing:
every single one of these effects is described by one explanation in the round earth model. But in the flat model, every single one of them requires a completely different backup theory to make them work. And in every single case, the backup theories (which are bendy light, celestial gears, conspiracy fakery, refractive atmospheric effects and unidentified invisible celestial objects respectively) have absolutely no solid data to back them up.