NOUN (2)

1. the practice of proselytizing;

2. the state of being a proselyte; spiritual rebirth resulting from the zeal of crusading advocacy of the gospel;

The Collaborative International Dictionary of English v.0.48:

Proselytism \Pros"e*ly*tism\, n. [Cf. F. pros['e]lytisme.]
   1. The act or practice of proselyting; the making of converts
      to a religion or a religious sect, or to any opinion,
      system, or party.
      [1913 Webster]

            They were possessed of a spirit of proselytism in
            the most fanatical degree.            --Burke.
      [1913 Webster]

   2. Conversion to a religion, system, or party.
      [1913 Webster]

WordNet (r) 3.0 (2006):

proselytism
    n 1: the practice of proselytizing
    2: the state of being a proselyte; spiritual rebirth resulting
       from the zeal of crusading advocacy of the gospel