i dont beleive one has to go to a non denominational church to freely discuss bible topics. Im an SDA and am a little reluctant to promote my own church too much here because I know there are many good churches out there also some SDA doctrine promoted by the right wing of adventism is way off the mark as far as the Protestant Gospel of Righteousness by faith is concerned. The Adventist doctrine of the investigative judgement is a very bad doctrine which in its purest form gives the beleiver no assurance of salvation but only a works based religion.
Of course not all SDAs go along with such perfectionistic type religion.
On the other hand SDAs have a very strong beleife in th priesthood of all beleivers and this means they take personal bible study and bible discussion very seriously.
A few years ago we had a family who had been studying with the witnesses leave and they went around to all the churches in the town where I lived at the time. This family found they could freely discuss the bible at the SDAs more than in any other denomionation. The family went to the Anglicans, baptist Uniting and they eventually became SDAs.
The meeting I would recommend at the SDAs is the sabbath school held before the divine service its something like the watchtower study except in my experiance as a third generation SDA at times there is no holds barred as to where a discussion may lead.
Someone said earlier they dont think that trinitarianism and arianism could co exist well it does in the SDA church. When barnhouse and martin studied SDAism they nearly gave the denomination cult status from the beginning because they went to the General Conferance with documents with the church logo supporting both the trinity and Arinaism. A whole suitecase full.
Dont let anyone tell you that you must beleive someting because a smart man changes his mind sometimes, but a fool never.
These thoughts are from my own experiance and many times i have enjoyed the discussion and fellowship of christians of other denominations. Barry