Ok you've made your intentions clear, now lets make some of the advice clear. (at the risk of getting the thread locked)
I fully respect your right to beleive and practice your religion as you feel fit as do I fully respect it is their right to practce theirs.
I dont respect the fact that you beleive that you have any right to extinguish anybody elses religious practices. It is this type of action that start wars.
If you choose to do missionary work, read what Chris said about learning about the people before you go and respect their way of life and their religion. Then help them in a practical way.