The shape of the earth has nothing to do with salvation.
Like it or not, I, and I suspect many others in this thread;
 state that the earth is a globe/sphere,
accept Genesis, creation, the flood and so on,
have faith in Jesus and accept him as our Saviour,
believe the Gospel, are saved, and children of God, every bit as much as you are.
Every so often we get someone from the flat earth society in our city centre. Among other things, they say that they are a non religious society. So there are some who believe that the earth is flat but don't believe in God at all.
Their flat earth belief is not important and can't hurt them; their unbelief in/rejection of God can and will ultimately affect them.