These are all narrow moral views that many Catholics and non-Catholics don't agree with so therefore they should not be what a country that espouses freedom of all religious beliefs should be basing its laws on. 

90 % of Catholics have used or are using birth control and Jesus never taught against using birth control and forms existed in his day.  The church has changed its teaching in the past on various things in order to correct its errors, and will need to change its laws on birth control too and on the exclusion of women from same ordination as men as this too has no backing in any teaching of Christ but breaks Christ's command to treat all others the same with no exceptions.