"religious" schools, not christian schools, makes hugh difference.
Now maybe there are a lot of abortions of those coming from christians schools, I don't know, but the article doesn't specify. So lets not fall into the world trap of counting anything chrisitan among other things of the world considered 'religious'.
Many times girls are taught the sin is having a baby out of wedlock, when in actuality the sin is having sex out of wedlock, once that sin has been committed, the sin is over, the baby is not a sin. how you ge tit was sin, but not the baby. we've made it shameful to have a baby, the sin focus shouldn't be the baby, but the sex that resulted in a baby. the shame shouldn't be having the baby, but premartial sex and abortion should be the shame.