Are you considered to be in opposition to the congregation if you perform the dhikr and tasbih after prayer and distance yourself from the prevalent innovations in mosques?

Adhering to thenah in dhikr and abandoning innovations is not a departure from the community. The community that must be followed is the one committed to the Sunnah, even if it is small in number. There is no consideration for the community of common people and those who violate the Sunnah. It has been narrated from Abdullah ibn al-Hasan ibn Ali ibn Abi Talib that he said: "What do you think if the ignorant become numerous, so much so that they become the rulers? Are they then the proof against the Sunnah?" It is necessary to invite to the Sunnah with gentleness and wisdom, and if it is not accepted, then the caller should adhere to the Sunnah and pray for guidance for those who oppose it. One must stay away from groups that do not adhere to the Sunnah, such as the Tijani Sufi groups, and a Muslim should strive for their community to be sunni.