ABC -- The Religion that Correctly Inherits Its Founder's Teachings.

Suppose X is the name of a religion

1. It is ABC that/which Only Correctly Inherits Its Founder's Teachings.

2. ABC -- The Religion that/which Correctly Inherits Its Founder's Teachings.

3. ABC -- the Religion that/which Correctly Inherits Its Founder's Teachings.

(a) Of the three statements above, which sounds the best to the native speaker's ear?

(b) For the second and third statements, should the 'the' be capitalised?

(c) Should 'that' or 'which' be used?

(d) If 'which' is the correct word, should there be a comma after "ABC" in statement 1?

(e) Should 'Only' be used in the statements?

Thanks.