Social Security taxes have been made part of the general fund, so cutting them would have no different effect on Social Security than cutting any other tax in the general fund.You are overlooking some factors I mentioned that will stimulate hiring, not just a savings in the cost of hiring another employee.
Employees having more money to spend from each and every pay check will stimulate demand for products, which will stimulate production of those products, which will stimulate demand for more workers to produce those products, for example.
What about savings or paying down personal debt? Are you proposing to do away with Social Security? Without payroll taxes, will people have the discipline to save for retirement? Social Security is not enough now to live on now. Americans have not shown the ability to live within their means so what money will they have for retirment if it is all spent?
Now you are just being funny...thinking that if you cut close to $900B in ss taxes that there would be no effect and expecting Congress to cut spending by $900B to offset the drop in taxes.