It’s a bit like being stranded on a roof during a flood. You see the helicopter coming and shout, “I’m saved!” Well, you’re not in the chopper yet, and the chopper hasn’t landed yet, so, as old Treebeard would say, “Let’s not be hasty.”
Good essay here about how a Catholic can respond to the question, “Are You Saved?”
http://www.jesus-is-savior.com/False%20Religions/Roman%20Catholicism/catholicism_is_of_the_devil.htm