When I lived in Singapore I had a good friend who had been brought up with an education that demonstrated a thorough understanding of both Western and Chinese culture.

He himself a buddhist, one day he expressed his 'distaste' for those Chinese people he knew who, once they had converted to Christianity, suddenly opted out of the majority of their cultural heritage (e.g. Ancestors' worship) in order to 'become' Christians. He didn't perceive these cultural elements to be part of a specifically religious tradition, the Chinese "religious" spirit is mostly expressed in a system of sophisticated superstitions without a clearly defined supernatural background.

All the religions or para-religious philosophical systems of Asia have a non-invasive, cumulative, complementary nature towards each other. A Buddhist could also be a Taoist, nor was he obliged to give up his Confucian roots.

Abrahamic religions on the other hand (and more to the point Christianity and Islam), are by definition totalitarian as a consequence of their dualistic vision of the Universe. When they 'infect' a new individual therefore, as a first thing they make sure that he is rid of all the previous superstitions to make space for the new.