Exclusivism is also refered to as Christian Particularism or Restrictivism.
Exclusivism holds that an explicit response of repentance and faith to the preaching of the Gospel is necessary for salvation. Until recently, this has been the dominant position of the church and still is the majority position in conservative evangelical circles.
– None Dare Call It Treason: Is an Inclusivist a Paul Revere or a Benedict Arnold? By Ken Keathley, Assistant Professor of Theology and Philosophy, New Orleans Baptist Theological Seminary. From the Journal for Baptist Theology and Ministry Vol. 1 No. 2 (Fall 2003): 101-114
Exclusivism is the belief that only one religion is true, and the others opposed to it are false. That salvation is only possible through Jesus Christ, and that all followers of false religions are bound for Hell. Only a minority of humankind will finally be saved.
– Religious Pluralism, Universalism, Exclusivism and Inclusivism, InPlainSite.org