It is wrong to relegate to museums all of the artifacts of a tribe or community THAT IS STILL LIVING, and many such tribes and communities ARE STILL LIVING IN THE PHILIPPINES. You will simply be telling your museum visitors, "Here are things that are all in the past and are no longer part of the modern world." All of those pieces that you label as "ethnic art" are implements that are BEING USED in everyday life.

Similarly, do not convert those tribes and communities to the religion you practice because, in doing so, you take away from them EVERYTHING.