to do this you would need to attend many meetings and be silent, respectful of al lthings.
when you first arrive tell them you want to learn the truth.
there will be many that will offer to assist you and they will arrange a bible study.
do that for 6 months.
slowly they will accept you.
during that process, ASK questions,,,
if you dont get answers then ask for another person to study with you.
that way you can go through several study conductors and another will hapily take you over as it is a power thing that they want to have the glory to bring a new one into the truth.
you will have to restrain yourself from preaching to them...
best you can do is target the ones sutdying with you and do not mention jesus or being saved..
keep sincere and respectful and just ask a LOT of pointed questions util clear answers are given...