Lord, how the heathen rage.

Non-Christians are profoundly offended by the doctrine of the Trinity.

This doctrine has long been the object of ridicule and scepticism by non-Christians and pseudo-Christians like Unitarians and Jehovah's Witnesses. It even confounds some true Christians who retreat into accepting the Trinity with only blind faith. Which is really laughable. Blind faith is not a rational defense.

First, the Trinity doesn't mean three gods. That concept is as irrational as any other polytheism, or pantheism either, for that matter.

Rightly understood, biblical Christianity explains the answer- even for modern man to be able to understand. Differing from the new theology of subjective and uncertain interpretations of the truth, it stands up to being rationally tested in lfe as we must live it.

The writers of Scripture said all things were designed to reveal the personality of God. Not in some pantheistic sense, but in the sense of an infinite and personal God who, on the order of the Trinity, created all else.

And!
And that this biblical Godhead of Father, Son, and Spirit must be discernable in everything that is. That this Godhead must be plainly understood as much as each person is supremely aware of his own existence.

This simple understanding of Christianity's systematic answer takes us back first to the very beginning and then as it flows on to an end. As the writers have told us, the fundamental nature of the cosmos is smashingly compatable with the Triune God of the Bible. Each part of everything relates to each other part and to the whole, and finally to what existed first. And rather than contradicting this biblical doctrine, the cosmos has been a resounding witness.  

Man has always recognized the intrinsic triune nature of the Space-Matter-Time universe. This universal experience always relates to just these three entities.

Modern science is still clearly that of a space-time-matter continuum with each of these three entities essential for the intrinsic character of the universe. One universe manifest in three essential elements.

All three equally universal and analogous to the universe and remarkably analogous to the character of the triune God. One God manifest in three persons.

Each equally and inseperably one. Lose any of the three essential elements or persons and it ceases to exist.
The physical universe is, by its very nature, the discernable evidence of its triune Creator. The continuum of space, matter, and time- where each is distinct and yet inseparable- reveal the triune character of God.

That's not all.

The three universals of the universe can also be described as trinities within themselves.

Space: can only be understood in the reality of its 3 dimensions- height, width, and depth.
Matter: is only understood by its three elements: mass, motion, and energy.

Time: by its past, present, and future.

All things point to the one triune Creator.