There are two stanzas in John Masefield's poem, "Laugh and Be Merry," where biblical/religious aspects can be found. Stanza two is as follows:
Laugh and be merry: remember, in olden time.
God made Heaven and Earth for joy He took in a rhyme,
Made them, and filled them full with the strong red wine of
The splendid joy of the stars: the joy of the earth.
Here, a reference is made to God's creation of the earth. The poem speaks to the idea that God is responsible for making both heaven and earth. Given that God filled both heaven and earth with "the strong red wine of his mirth" refers to the fact that God was happy when doing this. One could assume that the red wine refers to the wine shared with Jesus and the Disciples during the Last Supper, but given the reference to the beginning of earth, the wine may be a reference to the cliched "blood, sweat, and tears" God shed when making heaven and earth.
In the following stanza, Masefield refers to the deep blue cup of the sky. This stanza transitions from the last line of the previous stanza. Here, the majority of the stanza focuses upon the sky and stars. One could assume that the deep blue cup is referring to the way one can look into the sky and it continues on and on.
So we must laugh and drink from the deep blue cup of the sky,
Join the jubilant song of the great stars sweeping by,
Laugh, and battle, and work, and drink of the wine outpoured
In the dear green earth, the sign of the joy of the Lord.
Therefore, the poem's biblical and religious aspects are grounded in God's creation of the heavens (the sky) and the earth.