"At the end of the day, to be second here, on this track, I think it is very promising", said 19-year-old Verstappen, who could have been the youngest driver in the history of the sport to start on pole.
The stewards spoke to all three drivers after the race had finished but could not find sufficient fault in an incident they described as a "chain reaction", and duly ruled it had been a racing incident.
Sandwiched between the two Ferraris, Verstappen made contact with Raikkonen, sending the Finnish driver's vehicle into the pit wall.
While the three leaders were out on the spot, Alonso tried to continue after the resulting safety auto, but his McLaren was too damaged and he had to retire.
Formula One's Lewis Hamilton said a TV documentary had inspired him to go vegan to improve his health and avoid harming the planet.
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"God blessed me today, for sure", he said later, dripping with champagne.
Australian Ricciardo had been confident of victory, despite missing out on pole on Saturday but could not keep up with the Briton's pace on Sunday.
"As soon as it rained I knew where I was going to finish".
"I can't win the bloody thing".
"Guys what can I say - what a turnaround today!"
"It's bitter but it's done", said the German, a four times Singapore GP victor, whose retirement ended a run of 18 successive points finishes and left him with a mountain to climb. The remaining points places went to Force India's Sergio Perez and Esteban Ocon in fifth and tenth respectively, Williams' Lance Stroll in eighth and Haas's Romain Grosjean in ninth.
Mercedes declined to pit Hamilton under the safety vehicle but after the restart he reeled off a string of fastest laps on the slowly drying track, extending his lead over Ricciardo.