"What do people really mean when they say that many religions lead to eternal life? It might mean they don't believe their particular truth at all. Others might be saying, 'We believe a truth but respect other people, and they are not necessarily going to hell.'" ... Nearly across the board, the majority of religious Americans believe many religions can lead to eternal life: mainline Protestants (83 percent), members of historic black Protestant churches (59 percent), Roman Catholics (79 percent), Jews (82 percent) and Muslims (56 percent)...
"What most people are saying is, 'Hey, we don't have a hammer-lock on God or salvation, and God's bigger than us and we should respect that and respect other people,'" said the Rev. Tom Reese, a senior fellow at the Woodstock Theological Center at Georgetown University.
Quote taken from here.
The issues is not whether God is "bigger" than us but whether the God who is bigger than us can be "trusted" (/believed) when he both states and shows that there is only one way to heaven... that being through Jesus Christ, the only Redeemer of God's elect.
One must also distinguish between "respecting other people" and accepting or validating all their beliefs on the basis of "respect".
Finally, lack of knowledge and failure of some (or many) to embrace God's truth does not change the truth, therefore while some may take great delight in the numbers themselves, it's not the numbers that should be their ultimate concern.