My parents were and are heavily involved in their church - very mainstream old fashioned C of E (both have been church wardens, father now a lay preacher, endlessly involved in the social and fund raising side). It was very much forced on us. Until the age of 12 or so I mostly bought into it, but once I became capable of really genuinely thinking for myself and began to reject their religion they just "laid down the law", told me I'd grow out of my rebellious phase, wouldn't debate/ discuss my reasons for not accepting their views except to say things like "don't show your ignorance" or "you'll understand when you're older" (Dad) or to cry and emotionally blackmail (Mum).
I was forced to go to church every Sunday until my actions embarrassed them (I refused to go up for communion - just sat and didn't move at that point in the service, and of course during the service they couldn't force me and we're aware of people noticing - small church). It caused 2 years of huge rows and a lot of crying from my mother, but they wouldn't get into a discussion, they just insisted they were right, I would realise eventually, and til then I had to walk the walk.
Eventually at 14 they agreed I could miss ordinary Sunday church (because my younger siblings had started copying me not going for communion/ blessing and they wanted to stop the "rot") but they still insisted I attend on a range of "special" days (including both midnight and 9.30am at Christmas, and Chris tingle, and bloody carol singing).
They also insisted all their children be heavily involved in aspects of the church outside services - mostly broadly fundraising related (always directly for the fabric of the church, not for charity in a wider sense). We had to run stalls at fêtes, serve drinks at concerts or cheese and wine things, attend the weird meal based harvest events, go carol singing etc. We even had to clean the church as part of a rota at one stage when the church had no cleaner. All that continued even once I was let off ordinary Sunday services and I bloody hated it.
The thing I hated most was my parents refusal to discuss their beliefs in an analytical way, when combined with their insistence their children be part of the church.
It put me off spending Christmas with my parents and we always go to DH'S parents now. I am an atheist.
My sisters felt less strongly but none are Christian in the way my parents are. 2 are very conventional, don't rock the boat types and attend at Christmas and similar times and don't think it's anything worth getting worked up about. They live not far from my parents and are constantly roped into helping with the fund raising stuff (which my mother likes to take credit for then delegate) which they roll their eyes about but don't seem to mind too much - they see it as indulging the aged parents :o I must say I am less inclined to be indulgent and am happy to live too far away to be called on for church periferal activities; but as the oldest I fought all the battles for my sister's, and they reaped the benefits of a slightly less rigorous insistence on participation without having to go through years of fighting and emotional blackmail and being a disappointment to earn it...