Is there a difference between "blithe" and "beatific"?

A few days ago, I posted a question entitled "Am I wrong in my understanding of the word blithe?" (hyperlink here: ) on this website. An anonymous user said the second definition of blithe is more along the lines of " innate joyfulness"; at first, I didn't make any sense of this observation until last night. While mulling over the possible meaning behind this person's observation, I realized this word's second definition has similarities with the word beatific. This user's observation has gotten me interested in the difference between "blithe" and "beatific". I would gladly appreciate it if anyone would take time out of their busy schedule to shed some light on this dichotomy.

Reminder: Here are some definition entries for both words:

Source: Dictionary.com

Word: Blithe

Definitions:

1) without thought or regard; carefree; heedless

Example: a blithe indifference to anyone's feelings.

2) joyous, merry, or happy in disposition; glad; cheerful:

Example: Everyone loved her for her blithe spirit.

Source: The Free Dictionary

Word: Beatific

Definitions:

1. displaying great happiness, calmness, etc: a beatific smile.
2. (Theology) of, conferring, or relating to a state of celestial happiness

How does definition 2 of blithe relate to definition 1 of beatific? If they don't, how do these definition entries differ?