Why would that be preaching??
The phrase "The Absolute Truth" still means something to some people.
It is not something to toss around, as if it were something trivial.
Theists of various persuasions believe that people have the right to know about God.
Allright, I agree, and I believe that too.
And I also believe that people have the right not to be confused and mislead in the pursuit and name of God.
Theists, if salvation and integrity mean anything to them, should see to it that people do not get confused and mislead in the pursuit and name of God.
For this, they need to clear up things in their own lines.
We who are not of any particular religious affiliation, have every right to call the theists on this and to hold them responsible.