Christians in general merely pay lip service to wanting to know objective truth (whether knowingly or unknowingly), because they do not seem at all interested in the logically prior concern of what is the objectively correct way to obtain objective truth. They seldom ever grow out of the naive and utterly inadequate test of “sounds good to me”.
Without having an objective test, it is impossible to reliably obtain objective truth. (There are all kinds of ideas everywhere, all vying for the title of “objective truth”. Since usually there are more than two ideas vying for the crown, without a reliable test, we have less than even a 50-50 chance at obtaining the truth.)
Of course, we then have the logically prior problem of how to objectively determine that our so-called “objective test” is objectively the correct test to use, amongst the other competitors for the title of “objective test”.
This type of straightforward logical reasoning can actually go on indefinitely. In Philosophy, it’s officially called the regress argument.
There are various proposed solutions to this, and to my knowledge there is only one legitimate way, but of course it will be impossible to explain without explaining the prerequisite concepts of Logic, which entails interesting things like propositional logic, modal logic, binary logic, multi-value logic, bayesian logic, etc., which frankly, most people are either not interested in, or are not ready to deal with such esoteric ideas.
Job 12:24-25 New International Version (NIV)
24 He deprives the leaders of the earth of their reason;
he makes them wander in a trackless waste.
25 They grope in darkness with no light;
he makes them stagger like drunkards.