Eastbourne MP Stephen Lloyd visited Cavendish School and met with staff and pupils in the Religious Education (RE) department.
The visit earlier this month comes after MPs published a report on the supply of and support for religious education teachers.
The All Party Parliamentary Group on Religious Education is chaired by Mr Lloyd who had expressed concern over the teaching of RE in local schools.
The report called RE: The Truth Unmasked found that lessons in the subject are frequently taught by teachers with no qualifications in the subject.
During his visit to Cavendish School, which is now an academy, the MP said he found the school was continuing to teach good quality RE.
Mr Lloyd said, “RE teachers at Cavendish School and across Eastbourne are doing an excellent job in ensuring our young grow up with a thorough understanding of the different faiths and those with none - knowledge and skills that will equip them to tackle many of the challenges life presents.
“But the value of RE in schools across the country has been eroded due to various policies relating to the English Baccalaureate, academies and GCSE short courses.
“These pressures have led to non-specialist teachers trying to fulfil a role which requires expert knowledge and understanding of detailed issues.
“We must ensure that students are not short changed and are given the best possible chance to get the most from a subject that will help them thrive in an increasingly multicultural and diverse society.”
The report was delivered to the Secretary of State for Education, Michael Gove, on March 18 which includes recommendations for primary and secondary schools, teacher training providers, local authorities, Ofsted, the Department for Education and those providing professional development for teachers.