Seven-goal striker James Hanson wasted a glorious opportunity to give Bradford victory when he weakly sent a close-range free header straight at Shrimps stopper Barry Roche 10 minutes from time.
Bentley said: "It wasn't the greatest football spectacle in the world I have to admit but I cannot fault the lads from both sides for their tremendous effort.
"It was a difficult day to play attractive football but both sides tried to do that and I think a draw was a fair result overall.
"My heart was in my mouth when Hanson had that late chance but thankfully for us he didn't get the connection he wanted.
"We are now unbeaten at home since the middle of September and have only conceded four goals here in that time and that is a real positive for us.
"We didn't create too many chances in the game but we looked really solid again and kept a good shape, which was important against a very good side. We always knew it would be a tough afternoon but we gave it our all again and will take the point and move on."