DUP MP Sammy Wilson says he believes some state schools shy away from teaching recent Northern Ireland history because teachers want to avoid controversy.
Mr Wilson was speaking after a survey suggested that the curriculum itself could be dividing schools along the lines of the conflict. It shows that the overwhelming majority of Catholic schools teach a more modern unit, which covers 1965-98 and majors on the civil rights campaign and the Troubles.
But just under half of state schools teach the 1920-49 period instead, which features the Second World War.
The survey was carried out by two Year 11 classes in Stoke-on-Trent and Lancaster during lockdown.
It was conducted under the auspices of the Parallel Histories charity. Its founder Michael Davies revealed to The Guardian that a definitive bias along denominational lines was found.
Four out of 10 state schools, for which data was available, taught the earlier 1920-49 unit, compared with just one in 10 Catholic schools.
Mr Wilson said he believed this was because those teachers viewed their "audience" as less homogenous than in Catholic schools. "Maybe they are more fearful of offending pupils in this era of oversensitive snowflake students, or in some instances snowflake parents," said the DUP's Westminster education spokesperson.
Mr Wilson, a former teacher, added: "Also, there seems to be this middle-class Protestant guilt complex among many history teachers who seem to be unwilling to challenge some of the nonsense which is portrayed in history text books.
"I can remember parents raging about some of the content of textbooks when I was teaching and I used to protest to the history department, without any success."
Mr Wilson said it was "ironic" that Catholic schools have been far more willing to take teaching material produced by the Orange Order. "State schools and voluntary schools seem to think that it might demonstrate some kind of religious or political bias."
SDLP West Tyrone MLA Daniel McCrossan said: "It's concerning that there's such a clear correlation between the religious background of a school and the period of our recent history that they choose to teach.
"There's a real risk that if young people don't engage with the parts of our history that may be uncomfortable or challenging for them, that we'll double down on division for another generation.
"Every GCSE history student here should have an equal opportunity to explore our struggle for civil rights as well as learning about the contribution that people from Northern Ireland made in the fight against fascism.
"Learning more about each other, experiencing everyone's history, can only ever be a good thing and we need to be encouraging it as early as possible."
Alliance MLA Kellie Armstrong said: "For far too long those invested in division have enabled and proliferated segregation through education.
"Constant reflection on how CCMS 'saved' Catholic education, or the DUP's belief kids all should be brought into the state-controlled system, hides the fact our education system is failing to meet the needs of children."
She said that the CCEA curriculum enabled teachers to pick modules and parts of coursework they recognise and with which they were comfortable. "It's easier to teach one side of the narrative if that's the only narrative you have known," she said.
"By maintaining separate teacher training colleges and the exemption from Fair Employment in schools, we are allowing a Troubles narrative to permeate our teaching body. In turn this continues to teach segregated norms, when most of us wish to move away from the old way of looking at things."