There are many such scenarios - which is why discrimination is hateful and wrong. Period.
Under the Indiana law,
you could not use your atheism as a justification for discriminating against someone. The Indiana law only allows one to use one's religious beliefs as a justification for discrimination.
That happens to be part of what makes this law so unfair and unacceptable.
Do you by "unfair and unacceptable" mean that law doesn't treat everyone equally?