The OPs question is: should he pay for all of these deductions. The percentages he gives are approximately the sum of the employee's & the employer's contribution.
So my answer, in respect to the very helpful data sheet from Madfuzu, is he should not be paying for all of this, he should only be paying half. His employer is clearly trying to cheat him.
As Swisspea says, the OP also has to pay his share of the compulsory pension plan (Not stated here, about 10%) and his income tax, not stated here; use this website (Geneva 2011) http://www.estv2.admin.ch/e/dienstle...er/2011/ge.htm