The Christian has to ask how to evaluate other religions. We are all engaged in the work of transforming the world alongside people who are striving for the same goal and contributing equally as much for its realisation. Yet many belong to another religion or faith community.
The question: do these people participate in the work and fruits of salvation in spite of their own religious commitment or because of it? Christianity has answered this variously through the ages, but with answers heavily influenced by cultural experiences and national belongings. It is not easy to disentangle Christian tradition from social and cultural theories.
Before reflecting on these, it must be remembered that the Christian understanding of Judaism must be discussed separately; the relationship between Judaism and Christianity is unique, and in fairly recent times the French Biblical scholar Paul Démann has undertaken this in various articles to do with the relationship between Judaism in Christianity. He makes many suggestions, but many questions remain unsolved and a full theology of Christian understanding of Judaism has yet to appear.
It is abundantly clear that there is salvation in Judaism and the coming of Jesus in history did not take this salvation away. Scripture asserts that God made an everlasting covenant with Israel – you shall be my people and I will be your God; and through them all nations on the earth will be blessed. God kept promising a new covenant – not that the old one would pass away to be replaced by another, rather would the old one become new again as each generation made it its own; and written, not on stone, but on hearts of flesh.
All these promises were verified again and again in Judaism. Although Christians have not always been aware of it, Jews have continued to live passionately in fidelity to the covenant. Under tough conditions – exile, dispersion, persecution and holocaust – they continued to make the covenant ever fresh and new in succeeding generations.