Islam claims “No compulsion in religion…” Quran 2:256 only if you are a parent forcing your child NOT to convert to Islam!
Here is the background to that verse in the Quran from the Hadith :
“When the children of a woman (in pre-Islamic days) did not survive, she took a vow on herself that if her child survives, she would convert it a Jew. When Banu an-Nadir were expelled (from Arabia), there were some children of the Ansar (Helpers) among them. They said: We shall not leave our children. So Allah the Exalted revealed; “Let there be no compulsion in religion. Truth stands out clear from error.”
Sunan Abu Dawud 14:2676, also explained in Tafsir Ibn Kathir, Asbab Al-Nuzul by Al-Wahidi, trans. Mokrane Guezzo, and translated by Aisha Bewley,Dar Al-Taqwa Ltd., 2003, pp. 659-661.
Meaning, having taken their children and brainwashed them in Islam, Muhammad refused to return the children back to their parents in case the take them away from Islam. That is the actual context of that verse.
How do we compel our children and brainwash them in Islam? Well there is definitely compulsion in Islam. Thus this idea is abrogated (cancelled) when it comes to kuffars and apostates….. Ask any honest person how they grew up in Islam, and be ready for the horrors of forced studying and praying and fasting…but then they say “no compulsion” in Islam.