I woudl be more cautious and read around forums here with smilar situations.
There is no formal requirement for traditional/religious ceremonies BUT definitely required in some cases, such as arranged marriages. IRCC can be convinced that a civil ceremony was appropriate in India, but bluntly, the onus will be on you to demonstrate that your relationship is real and the civil ceremony is the correct (or only) choice. (And yes, often because of inter-community marriages, family disputes, caste issues, etc)
This is the weakest part of your case, the idea that hyou're going to do a traditional one in future. Again, bluntly, it gives the impression that you yourself don't consider the civil marriage the real one either, and that you are doing so only for immigration purposes - even if temporarily. I wouldn't even mention such plans.
You say you have been with your boyfriend for a long time, but how much time physically alone? Have you travelled together, can you document that, etc? FI the rest of your relationship information is weak, it may take some time to get approved.
By far the best solution would be to convince your parents that you are doing this - getting married to him - and they can participate or not. If they won't, consider doing as 'real' a ceremony as you can, invite other relatives from your side, and check other tips on the board. Things like demonstrating it is a real and public relationship and marriage can matter. If you can't do a traditional ceremony, at least have receptions with people attending.
In the end, IRCC won't likely refuse a couple where the only notable difference is parents not participating. (Parents not approving is a universal problem across cultures). It's the in-between where it may make the approval more challenging.
[A side note that my impression is that IRCC is more understanding where the 'rift' is due to something insurmountable for the couple - like different religions marrying.]
Good luck.