The 22-year-old winger, who has scored 22 goals this season, said: "We created lots of opportunities in the first half but in the second we showed more guts.
"We began the second half with greater drive. We have a very strong side."
Ronaldo is tipped to be in the running for the end-of-season domestic awards because of his rich vein of form.
His Portugal team-mate Nuno Gomes broke the deadlock against Belgium in the 52nd minute, with Ronaldo scoring from a header two minutes later. Ricardo Quaresma added a third on 68 minutes before Ronaldo completed his double.
Portugal are three points behind Group A leaders Poland, who have played a game more than the Portuguese.
Poland, who trounced Azerbaijan 5-0, are on 13 points.
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Jonathan Chin, Truly Asia (26/03/2007 at 10:54)