"Jesus answered and said to him, Truly, truly, I say to you, unless you are born again you cannot see the kingdom of God."
"Unless you are born of water and the Spirit you cannot enter the kingdom of heaven." John 3:3,5
Lloyd-Jones said it so well. I too, will not have fellowship, indeed it is impossible to have fellowship with people who deny the very elements of the Christian faith and deny Scripture's plain teaching.
Those who sit in the hearing of the Bible being read, and then turn around and voice unbelief in it and it's teaching, have openly declared war on the Word. I will not be part of that. And I will not be silent either. In such cases, like in a Bible study or Sunday School class where this takes place, you will hear my voice defend the Truth up and against the heinous rebellion folks so blatantly and unashamedly proclaim.
Jas 1:19 Know this, my beloved brothers: let every person be quick to hear, slow to speak, slow to anger;