This is a good point to add to this conversation. Just why does one believe what they believe when it comes to establishing the Word of God as they read it?
1) Human preachers/teachers have insisted their student apply the Word as they present it or face ostracization/shunning, as practiced by groups such as the Amish and JW's.
2) Human preachers/teachers allow the Holy Spirit to either confirm or reject the human "explanations" and the student may discern by the Holy Spirit the life application of God's Word.
Model #1 would equate to one preaching hell fire upon their congregation in order to make them follow a set "explanations" of Scripture. In this model the Holy Spirit is pushed aside and it is the preacher's convictions that are to be followed.
Model #2 would plant seed and water as God commanded and allow God through the work of the Holy Spirit to have the final application of the Word and the glory all Goes to God.
When you say you would like to have a separated church, as in you must believe TULIP or we do not want you in our congregation, nor do we want to fellowship with you, are you really following God's teaching in the Scriptures?
One can take the cult approach to Scripture and establishing congregations or families, and they may think this immunes their subjects from exposure to what they perceive as "false doctrines", but praise be to God, He did not let it up to man entirely to teach, He gave the Holy Spirit to assure man was not having the last word on these matters. Even in these cults the Spirit breaks through and saves some and leads them out, setting them free indeed.
We must all stand before the judgment seat of Christ and give an account, and this is even more serious for those who delve into the teaching/preaching realm. When I teach/preach, I will present the Word of God as I see it after much prayer and study, when there are subjects of controversy I will give the differing views, and when finished I will have peace that I did my part, it is God who will either confirm what I have taught, or will reject what I have taught to the hearts and minds of the students.