Memorable Service (edit 2.1 thanks all)

[Philatone]

sorry for the interruption!

On the ocean of pink islands, moves a shadow in the light;
through the doorway here at last, comes he.
Bearers of the coffin struggle round the font and fight
to establish rights of passage in this sea....enjoy the scene you paint
No one hears the organ play, all look stoically away;...again, the adverb--i get the intention, but i feel like there are other ways to express it
one or two glance back but drop their eyes.....in a way, this can contradict the line before (i can see arguments for both sides). regardless, it struck me as a bit extra
Held high, then low, the coffin starts alarmingly to sway,
as the hand of God attempts to stabilise....nice line, as well as the next

There is gravity around us and the dead are not immune.
The force that draws us down into the pit
cannot be resisted, though believers may impune
that once you’re gone then there’s an end to it....the line feels a bit clumsy with the "that" and the "then there's an"
It seems it was the man in front, who stopped to wipe his eyes,
as pain or passion caught him unawares.
The casket veered to left then right, then took a final dive
with the sound of logs a’falling down the stairs. ...i like. a part of me, though, says comparing a coffin to "logs" may be a bit too close, what with them both being made of wood

See them smile, see them snigger (though to laugh out loud, none dared);
with hands on mouths and eyebrows heaven raised.
Turning like the Trouping of the Colours, mourners stared,
‘til the organist decided, Lord be Praised,
that this would be her destiny, so unknown stops she pulled,
and loosed a mighty wailing, roaring din.
Such was the Vox Humana that the Forte all but culled
those that still could hear unaided…until then. ...again, a great scene

Those skilled in DIY re-assembled splintered ply
whilst professional grievers called it a disgrace.
A claim against The Maker was considered worth a try
as the lifetime warranty was still in place.
By good luck and by providence the cadaver stayed in wraps
and arguably was none the worse for wear;
but with bits of unknown body parts sticking through the gaps
to continue would have been too hard to bear....i feel like this description can be difficult to pull off, but you've done it

He was buried without incident, an ignominious end,
in a casket held together with much love.
Nothing much was said as he was laid in his last bed....need the period?
by the mourners grimly peering from above.
The shoes they wore still squeaked as they drifted off to pray,
with their pin-stripes creased but ties no longer worn;
In memory of the day that their pal had passed away
they had tied them round his coffin, every one. ....works even better with the first mention of ties in the first stanza. a good close i think

hope a thing or two will be helpful!