I was Anglican Catholic, brought seven children up in the church so , yes, would have been better to start as an infant, taking them out if they fuss and cry.But you did not, so deal with what you have now...not such a big deal hon. And the child is only three...hard to sit quietly for an hour at that age, but he can do it with help.
Nothing more frustrating or ruder than a crying , fussing child during service.
For my 3 yo grandson, we have a "bag" it has snacks, water or juice, stickers, foam puzzles, few takealong thomas trains, a cardboard castle to build, a knight in shining armor , play doh, potato head, ect ect.
Quite a few items as his interest varies. For snacks there are usually goldfish, or raisins, trailmix, sometimes a cereal/fruit bar, chex mix. Small things that take some time to eat.
And favorite story books just for church, some popups.
There is a bible story book that has little doors on each page with a picture and verse under each door.
If he starts to wander or fuss we take him out of the sacristy.
One thing that helps is to let ours put the money in the collection plate, that takes up ten or fifteen minutes waiting for it to get to him..hehehe.
It should not take long to acclimate your son to a service and an hour is not that long, yes?
Your husband should be able to handle this well with a well packed church bag.
Tincture of time and patience and this , too, shall pass.
Best wishes and God bless.
Oh oh oh, have one son, and one grandson who took a loooooooooong time to sit quietly in church.
AND we have an awesome crying room, a changing table, couple canadian rockers, is mostly soundproof, AND it has a knob to adjust volumne from front of the church so we can hear the sermon. Light adjusting knob too.