Sometimes its easier to direct Jehovah's Witnesses to the official site, so here are a few for you.
http://www.watchtower.org/library/dg/article_11.htm: God's people are now being trained for everlasting life in the new world. They are learning the spiritual and other skills needed to develop a paradise. We urge you to choose God as Ruler and support the lifesaving work he is having done throughout the earth today. Study the Bible with Jehovah's Witnesses, and come to know the God who really cares about you and who will bring an end to suffering. In this way you too can become part of the foundation of the new world. Then you can confidently look forward to gaining God's favor and living forever in that marvelous new world
http://www.watchtower.org/library/lmn/article_11.htm: Your urgent need now is accurate knowledge. (1 Timothy 2:4; John 17:3) Where can you get this? Can it be found in just any religion? Some people say all religions lead to the same goal, just as all paths on a mountain lead to the summit. How mistaken they are! In order to find the right path, mountaineers use maps, and they hire guides. Likewise, there is only the one religion of truth that will lead to everlasting life, and guidance is needed to find it
http://www.watchtower.org/library/rq/article_05.htm7: God's original purpose for the earth will thus succeed. Would you like to share in these future blessings? If so, you need to keep learning about Jehovah and obeying his requirements. Attending meetings at the local Kingdom Hall of Jehovah's Witnesses will help you to do so
http://www.watchtower.org/library/w/2004/6/1/article_02.htm: If you want to please God, religious affiliation is vital—but not with just any religious group or denomination. You need to base your choice of religion on accurate Bible knowledge, not on unproved dogmas or hearsay. (Proverbs 16:25) Learn the requirements for true religion. Compare them with your own beliefs. Then choose accordingly
The above article references the follow url...
http://www.watchtower.org/library/rq/article_13.htm: 1. Jesus started one true Christian religion. So today there must be just one body, or group, of true worshipers of Jehovah God.
http://www.watchtower.org/e/20000215/article_02.htm: May we never be tempted to venture into the danger zone for whatever reason our mind might come up with, since the day we cross the line back into the world could be the day of Jehovah. Take refuge along with Jehovah's people and stay with them.
And the OFFICAL belief is this:
They believe that there is only ONE religion. However, the dead will be resurected and judged, and INDIVIDUALS of existing religions MAY survive if God feels that their heart condition warrents it. The distiction is subtle, and has been used resently by Mr Brown.
http://www.watchtower.org/library/jt/article_08.htm
Do the Witnesses believe that their religion is the only right one?
Anyone who is serious about his religion should think that it is the right one. Otherwise, why would he or she be involved in it? Christians are admonished: "Make sure of all things; hold fast to what is fine." (1 Thessalonians 5:21) A person should make sure that his beliefs can be supported by the Scriptures, for there is only one true faith. Ephesians 4:5 confirms this, mentioning "one Lord, one faith, one baptism." Jesus did not agree with the modern, relaxed view that there are many roads, many religions, all leading to salvation. Instead, he said: "Narrow is the gate and cramped the road leading off into life, and few are the ones finding it." Jehovah's Witnesses believe that they have found it. Otherwise, they would look for another religion.—Matthew 7:14.
Do they believe that they are the only ones who will be saved?
No. Millions that have lived in centuries past and who were not Jehovah's Witnesses will come back in a resurrection and have an opportunity for life. Many now living may yet take a stand for truth and righteousness before the "great tribulation," and they will gain salvation. Moreover, Jesus said that we should not be judging one another. We look at the outward appearance; God looks at the heart. He sees accurately and judges mercifully. He has committed judgment into Jesus' hands, not ours.—Matthew 7:1-5; 24:21; 25:31.
steve