"Grain of Salt"

[tomoffing]

Some suggestions included below.

Thanks for the read, asking some questions that not enough people do I think.

Btw you shouldn't capitalize every line. only those following full stops, exclamations, question marks etc. Not commas.
Have a read of some of the poems in the more advanced forums and you'll get the idea.

I've given up on promises Full stop here?
Making them. Keeping them. Believing them. This is a strong opening. The repetition gives completeness to your disillusionment.
They're lies in sheep's clothing nice wordplay with a familiar cliche, good image
To be digested with a mountain, not grain, of salt Another fine image, but these two lines together don't work for me. Are you eating the lies or wolves. perhaps try splitting the images somehow.
With the sole purpose of convincing some child
That the world is brighter, safer than it is. There's nothing happening in these lines, your idea has great potential though. Try to find an active metaphor to illustrate this. sinister santa clause, or an evil easter bunny maybe.
The promise, the primrose of hypocrisy! Good wordplay again, but the primrose has no context. I need more to understand you.
Because no one is ever sure that something can and will happen Too many words here. 'No one's sure something will happen, or even can" maybe
Beyond a reasonable doubt.
And if they say they're certain, Don't need "And" here
They're not interested in the truth.
Because the truth is, Again you don't need because. I think these lines would be improved by referring generally to truth in your first line. E.G.
"They're not interested in truth.
The truth is,"
Promises were made to be broken.