Sefton Central Labour MP Bill Esterson said the majority of people surveyed in Crosby oppose Sainsbury's current plans for the Village.
Speaking after knocking on doors in Crosby on Sunday, Bill said the Sainsbury's issue was residents' main concern.
Sefton planning committee last week followed the MP's request to defer making a decision on the plans. They are now scheduled to vote on whether to give the plans the green light next month.
Bill said: "There is a clear majority against these plans. People are concerned that the scale of the proposal is simply too large for the Village.
"Other issues of concern are the accompanying traffic increase and the fear that a supermarket on the scale that is being suggested will radically change the nature of this community.
"That is why I welcome the Planning Committee taking the time to fully assess the impact of Sainsbury's plans while also considering alternative plans.
"Some people want the plans to go through as they stand to make sure that there is development in Crosby as soon as possible but most people we have spoken to want a scaled back version, more in keeping with the Village.
"Having spoken to hundreds of people in Crosby, it is clear that most are against the current plans, which makes it very surprising that the Lib-Dems say that the 'silent majority' support Sainsbury's. That is certainly not what we found on the doorstep this weekend."
Blundellsands Labour Action Team leader Ben Winstanley has compiled many of the concerns raised by residents together with the views left on the Sefton Central Labour Party website survey which he will present to Sefton's Planning Department.
Ben said: "People both on the doorstep and through the website are making some very valid concerns about these proposals.
"We obviously want the members of the planning committee to make their decision having heard all the views of the residents of Crosby.
"That is why I will personally ensure that all of the views are passed on to the planning department.
"If people want to have their views aired, I'd urge them to fill in the survey on our website."
To have your say, go to seftoncentrallabour.co.uk