1) Wouldn't we see the curvature of the earth in the distance going up into the sky?
No. Your eye stays level with the horizon.
2) How does gravity work if you're inside a ball? Is it like a fairground ride that spins to "stick" you to the wall?
Force is irrelevant in relation to their being a force that holds you down to the ground, you can call it gravity, aether, higgs field, whatevah.
3) How big would the ball have to be so that when I look up through a powerful telescope I see space instead of the other side of the interior wall of the ball?
Light travels on a curve, plus the wall of the central celestial sphere would block your vision of the other side of the Earth wall.
4) How does my sat nav work???? Since everything it's based on is wrong it should fail horribly
All calculations are based on a stationary earth with sats orbiting inside, open any space app to see.
5) Since the website that you're linking to is a creationist site, why would a god create such a weird system? surely being on the outside of a ball is easier all round? (no pun)
I am God, I like games.
6) Do you really believe this? Really? If so please explain why, in your view, this explains the obsevable universe better than current empirical evidence
Give you a couple days of sincere, honestly, empirical study, and get back to me.
Don't believe the numbers, they lie.
Money makes the world go round, lol.
Why would they want to tell you the truth and loose all that wealth.
Keep you stupid so they can make money.
NASA is a money making machine. Find out how many corporations are in bed with NASA.
k?
K.