There are many things wrong with the gospel Jehovah's Witnesses preach. Here is one.
According to their literature, ONLY those associated with the Watchtower Organization will survive Armageddon into the new system. Is this what the Apostles preached as gospel?
Only Jehovah's Witnesses, those of the anointed remnant and the "great crowd," as a united organization under the protection of the Supreme Organizer, have any Scriptural hope of surviving the impending end of this doomed system dominated by Satan the Devil." Watchtower 1989 Sep 1 p.19
"During the final period of the ancient world that perished in the Flood, Noah was a faithful preacher of righteousness. (2 Peter 2:5) In these last days of the present system of things, Jehovah's people are making known God's righteous standards and are declaring good news about the possibility of surviving into the new world. (2 Peter 3:9-13) Just as Noah and his God-fearing family were preserved in the ark, survival of individuals today depends on their faith and their loyal association with the earthly part of Jehovah's universal organization." Watchtower 2006 May 15 p.22 "Are You Prepared for Survival?"
"Similarly, Jehovah is using only one organization today to accomplish his will. To receive everlasting life in the earthly Paradise we must identify that organization and serve God as part of it." Watchtower 1983 Feb 15 p.12
"... to leave Jehovah's organization ... we would lose not only the privilege of doing God's will but also the hope of life in God's new world." Watchtower 2016 Jun study ed p.26
"But if we were to draw away from Jehovah's organization, there would be no place else to go for salvation and true joy." Watchtower 1993 Sep 15 p.22
"They must appreciate that identifying themselves with Jehovah's organization is essential to their salvation." Kingdom Ministry 1990 Nov p.1
"At this stage of the affairs of man, it is absolutely impossible for anyone, professed Christian or otherwise, to stand independently of the one organisation that is bearing witness worldwide to Jehovah, his goodness and supremacy in accord with the 145th Psalm and, in fact, in accord with all the Scriptures." Yearbook 1982 p.259