OPINION: Why an openly Christian group was permitted to preach their values via workshops within the secular Singapore school system?

The Malay Mail Online, 12 Oct 2014
Why is it that an openly Christian organisation (www.focusonthefamily.com) was permitted to conduct such a workshops within the secular Singapore school system?
This level of influence challenges the idea of a secular state. Nowhere else is a person more vulnerable to conditioning that at school which is perhaps why groups with social agendas are so keen to