It cannot be denied that every serious religion has produced its share of saintly men and women, and also that bad things have been done in the name of every religion. In both cases some more than others but still the point stands. Does this mean that every religion is equally valid and that they all come from God and have the same divine stamp of approval? That they simply represent different expressions of divine truth and are intended for different groupings of people?
My answer to this is a definite no. There is a hierarchy in religion as there is in everything else and top of the hierarchy is Christianity. That is because Christ is the one perfect divine revelation because he is indeed the Son of God and Saviour of Mankind.
Most religions probably have some kind of divine input and if they don't at the beginning then they become influenced by truth from on high as they develop and grow. I say most not all because some now passed and more localised are clearly demonic in origin. But of the great religions in the world which have spread significantly beyond their point of origin I would say all contain in part the presence of God. He can be seen, again in part, through the window of the religion.
However, this presence is always veiled except in the case of Christ where it is seen directly. This is because Christ was not a prophet or avatar or incarnated spiritual being of some kind sent from God, all of which are in some degree limited if not contaminated by appearing in the world of matter. Christ was the pure essence of God and there was no limitation or contamination in him. This is what without sin means. He was the naked truth of spirit shining directly, unimpeded by matter. And his teaching was twofold. First, there was the basic teaching which in many ways was not dissimilar to other spiritual teaching even if it was more direct and to the point. But then, and more importantly, there was his person. Christ taught through the medium of his person. He was (and is) the truth, and when he said no man comes to God except through him that is also the truth.
Now, Christ can appear in non-Christian religions through inhabiting with his spirit aspects of those religions, and this is why members of those religions can become saints if they follow the Christ-inhabited aspects of their religion. But, even so, this is not as direct an approach as through the image of Christ that has come down to us through scripture, tradition and art, all divinely inspired. But Christ also lives or can live in our hearts and anyone can meet him there if they open themselves up to his holy person. This then transforms the individual from the worldly material self to a spiritual being. Furthermore, it is the only thing that can do that.
Christ is qualitatively different to every other spiritual being because they partake of him but he only partakes of himself.
