I see this A Lot in discussions online, and sometimes in real life. Secular liberal apostasy (i.e. the stepwise process of losing faith and leaving Christianity) presents itself as heresy (i.e. an unorthodox type of Christianity).
Traditionalists fall into the trap because they are unwilling to judge the true motivations of the liberalisers. Instead they try to resist apostasy legalistically - by more tightly defining and enforcing theological doctrines and rules of church order. They do this because it seems more 'objective'.
But the more tightly they define and enforce the 'objective' rules and practises of their denomination or church; the more they separate themselves from other Traditionalist Christians.
So, with legalism traditionalist Roman and Orthodox Catholics are driven apart, Catholics from Protestants, Episcopalians from Congregationalists. All the above are driven apart from Mormons, Jehovah's Witnesses, Seventh day Adventists...
In the end, the Christian Traditional 'voice' becomes a Babel of increasingly mutually hostile factions. Christianity - as such - is weakened.
This is the consequence of Traditionalism resisting liberalism by increasing legalism.
