I am a former Universalist. Universalism, classically speaking, does not deny the necessity of Christ's saving work nor does it assert that all religions are equal. Christian Universalism teaches:
1. Christ's saving work was necessary for the salvation of any man.
2. Christ's saving work effectively procured the salvation of all men.
This does not mean, however, that all religions are true (the Christian Universalist would deny, for instance, that Buddha did anything to effect salvation), or that they are equal in any way. Christian Universalism does not teach that you can be saved by Buddha, but that Buddhists can be saved by Christ.