Is this the song you have in mind? I found it at the web site of The Black Brothers. It is on their album "Time for Touching Home" (1989).


SWEET LIBERTY
(John Shields)

A little Irish man am I,
A radical indeed, sir,
And radical I mean to die
In my religious creed, sir.
I love all men, I do declare.
Me church has taught me this, sir.
To some me love is quite sincere.
To others it is less, sir.

CHORUS:
Sweet liberty's the thing for me,
For it I ever feel, sir,
And Ireland free from slavery
It is the prayer of Shields, sir.

A man of my religious creed,
Suppose he was a bad man;
Were I to help him in his need,
Would I not be the madman?
The Jew he is me fellow man.
The Turk the same indeed, sir.
To the infidel I'd wish him well
And help him in his need, sir.
CHORUS

If one is good, it's naught to me
What is the creed or clan, sir.
The earth is all one family
From Adam and Eve began, sir;
But the one who puts oppression down,
Well, that's the one for me, sir;
I care not whether black or brown
Or church or country, sir.
CHORUS