The hosts were made to work hard by a stubborn Saints side squandered the best chance of the match through Lee Jones in the first half.
The match swung Trinity’s way when a goalkeeping error gifted them the lead 15 minutes from the end.
Young Nick Hogan panicked taking a pass from a colleague and after letting the ball bounce twice he was off balance to boot the ball low into his own net.
A couple of minutes from the end John Beatson scored Trinity’s second after getting behind St Paul’s defence.
Trinity play Jersey Scottish next, on Saturday 2 April at Trinity, and they must defeat the current champions to move to within two points of them.
Both teams then have one game remaining – Trinity away to Grouville on 9 April with Scottish visiting First Tower the same day.
Meanwhile the dog fight at the bottom of the table continues.
The Portuguese Club joined Jersey Wanderers on seven points after they defeated St Ouen, who are on eight points, 4-2 at the IJ Bathe Field.
Former professional José-Manuel Vieira was the Portuguese hero scoring twice and having a hand in one of the two goals netted by Michael Teixeira.
St Ouen, who were level at 2-2, hit the target through Jonathon Evans together with an own goal.
Wanderers, who have three to play while Portuguese have two and St Ouen one, were beaten 4-1 at home by St Peter.
José Costa hit Wanderers’ consolation with St Peter, who joined Grouville in joint third position, registering through Stuart Cameron (two), Martin Paton and Gary Freeman.
Grouville and First Tower matched their result in the first league meeting of the season – a goal-less draw.
St Brelade gained promotion to the top flight for the first time in the club’s history after winning 3-1 against Magpies.
Liam Sutton, Jack Crawford and a ‘Pies defender scored for the Saints, Tim Chapman replied.
Second-placed Rozel Rovers, who have a game in hand, scored five without reply at Le Couvent against St John.
On target were Jon Carter (two), James O’Haire, Andy McCabe and Tony Zonfrillo.
Third and fourth-placed St Clement and Jersey Nomads were also victorious, St Clement 3-0 at home to Sporting Academics and Nomads putting five past St Lawrence without replay at Les Quennevais.
Matt Scriven (two) and Jamie Smith scored for St Clement and Mark Herridge (two), Carl Winn, Ged O’Donoghue and Paul Lees for Nomads.
Andy McNight hit a hat-trick and Simon Logan a singles as Beeches Old Boys returned 4-1 winners from St Martin/SCF.
Jersey Scottish require one points from three games to secure the Reserves Division I title.
Scottish won 7-0 at St Clement on Saturday after Reuben Legge scored four times and Craig Duxbury, Joe Finnegan and Jordan Docherty once each, Docherty direct from a corner kick.
Second and third-placed First Tower and Jersey Wanderers shared four goals at La Hague Manor.
Bruno Pires and Adam Speight notched for Tower and Andy Larose and Justin Jouan for Wanderers.
The leading two teams in Reserves Division II both lost in the Lady Bingham Trophy.
St Ouen 2-0 at St Brelade where Mark Kelly and Tony Barnes were on target while St Peter went down by the same score at St Lawrence, where Jonathon Tuck grabbed a brace.
Michael Perreira, Jamie Savory and Jamie Roberts bagged Sporting Academics’ goals in a 3-0 win against St Martin/SCF at the Airport.
Jersey Wanderers and Grouville will meet in the Securicor Locksmiths Trophy final after semi-finals wins against Beeches OB and St Peter.
Wanderers came from behind to win 6-4 against Beeches; while Grouville and St Peter shared four goals after extra-time before Grouville won 5-4 on penalties.
Clive Richardson and juniors Ollie Thompson (two), Scott Slicer (two) and Stevie Reid hit Wanderers’ goals with Paul Skinner replying with a hat-trick and Shane Moyse a single.
Liam Kelly and Marc Courval netted for Grouville and Phil Kendall for St Peter whose other goal was an own goal.
