I am puzzled as to how you could go live in spain and your catholic religion go out the window.... its a seriously catholic country!
Then, you seem to have waited until after or around, the time your daughter is starting at a catholic school, to start attending Mass.
But you don't make arrangements for the children to be baptised.
Catholics absolutely have seriously ill children baptised. I went to catholic schools and convent school, and all my family were baptised within a month of birth. Not years later after parents decided to decide to be catholic after all to get them in a school.
I get fed up of people saying they had a child baptised (at age 2) and started going to church yet don't get top priority for school places. Its because the priests can tell which families start going to church just to get in a school. For every family that 'turn' catholic when they start thinking about schools, there are many others where the parents have gone to church every sunday all their lives, have their babies baptised at a few weeks old.
Your children can't be practising catholics if they haven't even been baptised! And if priests are now insisting that parents take a baptism course before their children are baptised, then its about time. Sil and her bf are not catholic, but they smelled a better school, went to church for 6 weeks, got their dd's baptised the sunday before the schools applciations deadline, got their school place for dd1, but never went to church again after the baptism.
Then last week sil was moaning that dd1 'had to go and wave a palm leaf at a scabby donkey'.
If your priest is delaying the baptism knowing that this will jeapardise your childs school place then I think he thinks you are just one of the many parents who claim to be catholic just to get a school place.