God tells us what he is like and what he wants. God makes himself known, giving us a standard by which to measure all other religious claims. The parable of the blind men does not take this into account. There is a second problem with the parable. It presumes that Christians reject pluralism merely because they lack exposure to other beliefs, much as the blind men erred because each had explored only a part of the elephant.
Christians are just uninformed and narrow-minded.
This is not the case. Christians reject pluralism, in part, because the defining elements of different religions contradict each other. Contradictory claims can't be simultaneously true. Religious pluralism is false on deductive grounds, not inductive. The third objection is the most serious.