Omnism is the belief that all religions are one in the same. An Omnist is someone who seeks and is open to spiritual truths from many religions and then comes up with their own individual form of faith or spirituality. The key is what has meaning and relevance to each individual in their seeking. You could say that for Omnists the focus is spirituality more than religion and the general approach is exploratory and open minded rather than dogmatic and rule-based.
(Direct lines of text were taken from http://omnism.com/om/home.htm)