Watchtower quotes.

"There are billions of people who do not know Jehovah. Many of them in ignorance practice things that God's Word shows to be wicked. If they persist in this course, they will be among those who perish during the great tribulation."
"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, Jehovahs people are making known Gods 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 Jehovahs universal organization." Watchtower 2006 May 15 p.22 "Are You Prepared for Survival?" Paragraph 8
"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

"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

"Is it presumptuous of Jehovah's Witnesses to point out that they alone have God's backing? Actually, no more so than when the Israelites in Egypt claimed to have God's backing in spite of the Egyptians' belief, or when the first-century Christians claimed to have God's backing to the exclusion of Jewish religionists." Watchtower 2001 June 1 p.16