An illusion it will be; so large, so vast, it will escape their perception...

Consenting to suggested (information) tempts one to ignore perceivable (inspiration)...like suggested words over perceivable sound (spell-craft).

those who will see it will be thought of as insane

Insane aka IN SANUS (within sound)...which escapes the perception of all those labeling others with suggested "insane".

we will create separate fronts

Consenting (want or not want) to suggested creationism shapes a want versus not want conflict called "reasoning", hence a separated front (want vs not want) within a conflict (reason) over the same suggestion (creationism).

we will behave as if not connected to keep the illusion alive

Those who suggest IN NOMINE (in the name of) patris et filii et spiritus sancti will be ignored by those who consent to patris et filii et spiritus sancti, and who are then busy reasoning (want vs not want; true vs false; belief vs disbelief; good vs bad) about the suggested meaning.

In short...those making suggestions will be ignored by those who consent to suggested.

they will never be with the oneness of all

One (perceiving partial) within oneness (perceivable whole) can be tempted by suggestions (fiction) from others one to ignore perceivable oneness (reality), hence living their entire lives, while watching reality through the lens of fiction.