The Dutchman insists his side's form will begin to improve but admits his teammates were "too sloppy" during United's 1-1 draw with Sunderland.
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The Red Devils are still without a win in the Premier League under the highly rated Dutch coach, with last weekend's 2-1 defeat at home to Swansea being followed up with a 1-1 draw at Sunderland on Sunday.
Juan Mata opened the scoring at the Stadium of Light but United struggled to create any more clear-cut chances and was ultimately forced to settle for a draw after Jack Rodwell’s equalizer.
“Everyone has faith and believes in this club and our players because we have great players because it’s just a matter of time until the points come in,” Van Persie told Sky Sports. “We lost two points [against Sunderland]. Clearly we came here to win. If you come in front after 15 minutes or so, we should have kept the score for longer. It’s always harsh to concede from a corner.
“In ball possession we were a bit too sloppy, lost too many balls, making it hard for ourselves.”