Teologie is belangrik.

Yes. Teologie is the Afrikaans word for theology. It is a clear cognate, so it is easy to recognize if you know English.

The spelling is slightly different:

• English: theology
• Afrikaans: teologie

Afrikaans often uses more phonetic spelling than English.

Is is the present-tense form of the verb wees meaning to be. In this sentence, it links the subject teologie to the description belangrik.

So the structure is:

• Teologie = subject
• is = linking verb
• belangrik = adjective/complement

No. This is one of the nice simplifications in Afrikaans.

Afrikaans uses is for all persons in the present tense:

• Ek is = I am
• Jy is = you are
• Hy is = he is
• Ons is = we are
• Hulle is = they are

So in that sense, Afrikaans is simpler than English.

Because belangrik is a predicate adjective: it describes the subject after a linking verb.

This works very much like English:

• Theology is important
• Teologie is belangrik

So the adjective comes after is, not before the noun.

After is, Afrikaans normally uses the basic form of the adjective, so belangrik is correct here.

Compare:

• Teologie is belangrik. = Theology is important.
• 'n belangrike vak = an important subject

So:

• after is: usually plain adjective → belangrik
• before a noun: often -e form → belangrike

Because teologie is being used in a general, abstract sense, like English Theology is important.

Afrikaans often leaves out the article when talking about a field, idea, or subject in general:

• Musiek is belangrik.
• Geskiedenis is interessant.
• Teologie is belangrik.

If you added die, it would usually sound more specific, depending on context.

It is capitalized only because it is the first word of the sentence.

Afrikaans does not capitalize all nouns the way German does. So in the middle of a sentence, it would normally be lowercase:

• Ek dink teologie is belangrik.

Yes. This is a very normal simple statement.

The order is:

• subject
• verb
• complement

So:

• Teologie = subject
• is = verb
• belangrik = complement

This matches basic English word order quite closely.

A rough guide:

• teologie ≈ tee-oh-lo-KHEE
• belangrik ≈ buh-LUNG-rik

A few notes:

• In belangrik, the ng sounds like the ng in sing
• The g sound in Afrikaans is often a guttural sound, similar to the ch in Scottish loch or German Bach
• The exact vowels are not exactly like English, but those approximations are close enough to help you get started

Here it is being used as an uncountable abstract noun, just like English theology when you mean the subject or field in general.

So this sentence is talking about the field of theology as a whole, not about one theology versus many theologies.