If the elders think you are promoting a false teaching (by talking to others in the congregation, some elders might view it this way). If someone who claims to believe there is a God can be disfellowshipped, a person who does not is in danger of being df'd. The time lapse in others situations could come under the statement, "perhaps such persons can be restored."
*** w89 10/1 p. 19 par. 14 Maintain Your Faith and Spiritual Health ***To protect the spiritual health of the congregation, elders need "to exhort by the teaching that is healthful and to reprove those who contradict." (Titus 1:9, 13, 16; 2:1) Perhaps such persons can be restored to a spiritually healthy state. (2 Timothy 2:23-26) But what if they unrepentantly promote false teaching? Then, in effect, they must be quarantined. They are disfellowshipped, and we stay away from them so that their spiritual infection does not spread to us.—Romans 16:17, 18; 1 Corinthians 5:9-13; Titus 3:9-11.
*** w86 4/1 p. 31 Questions From Readers ***Approved association with Jehovah’s Witnesses requires accepting the entire range of the true teachings of the Bible, including those Scriptural beliefs that are unique to Jehovah’s Witnesses. What do such beliefs include?
That the great issue before humankind is the rightfulness of Jehovah’s sovereignty, which is why he has allowed wickedness so long. (Ezekiel 25:17) That Jesus Christ had a prehuman existence and is subordinate to his heavenly Father. (John 14:28) That there is a "faithful and discreet slave" upon earth today ‘entrusted with all of Jesus’ earthly interests,’ which slave is associated with the Governing Body of Jehovah’s Witnesses. (Matthew 24:45-47) That 1914 marked the end of the Gentile Times and the establishment of the Kingdom of God in the heavens, as well as the time for Christ’s foretold presence. (Luke 21:7-24; Revelation 11:15–12:10) That only 144,000 Christians will receive the heavenly reward. (Revelation 14:1, 3) That Armageddon, referring to the battle of the great day of God the Almighty, is near. (Revelation 16:14, 16; 19:11-21) That it will be followed by Christ’s Millennial Reign, which will restore an earth-wide paradise. That the first to enjoy it will be the present "great crowd" of Jesus’ "other sheep."—John 10:16; Revelation 7:9-17; 21:3, 4.
if a Christian (who claims belief in God, the Bible, and Jesus) unrepentantly promotes false teachings, it may be necessary for him to be expelled from the congregation. (See Titus 3:10, 11.) Of course, if a person just has doubts or is uninformed on a point, qualified ministers will lovingly assist him.