Din onun için önemli.

In Turkish, the verb to be is often not stated in simple present-tense sentences.

So:

• Din onun için önemli = Religion is important for him/her
• literally: Religion for him/her important

This is very normal in Turkish. In the present tense, when the predicate is a noun or adjective, Turkish usually leaves is/are unspoken.

If you wanted past tense, then Turkish would show it:

• Din onun için önemliydi = Religion was important for him/her

Here, onun için means for him, for her, or for it.

Breakdown:

• o = he / she / it
• onun = his / her / its, or of him/her/it
• için = for

Together, onun için is a fixed and very common expression meaning for him/her/it.

So in this sentence, it tells you from whose point of view religion is important.

Because the postposition için usually combines with pronouns in a special form.

With personal pronouns, Turkish commonly uses these forms:

• benim için = for me
• senin için = for you
• onun için = for him/her/it
• bizim için = for us
• sizin için = for you (plural/formal)
• onların için = for them

So onun için is the normal grammatical form.

Yes. Onun için can also mean therefore / that’s why / for that reason in other contexts.

For example:

• Hava çok soğuk. Onun için dışarı çıkmadım. = The weather was very cold. That’s why I didn’t go out.

But in Din onun için önemli, it clearly means for him/her, not therefore.

Why? Because it fits the sentence structure:

• Din = religion
• onun için = for him/her
• önemli = important

So the meaning is about importance to a person, not cause-and-effect.

Önemli is an adjective meaning important.

In this sentence, it works as the predicate:

• Din onun için önemli. = Religion is important for him/her.

This is very common in Turkish: an adjective can stand at the end of the sentence and function like is important, is big, is difficult, etc.

Compare:

• Ev büyük. = The house is big.
• Bu zor. = This is difficult.
• Din onun için önemli. = Religion is important for him/her.

Yes, Turkish word order is flexible, but different orders change the focus or emphasis.

The neutral order here is:

• Din onun için önemli.

Other possible orders include:

• Onun için din önemli.
  • Emphasis more on for him/her
• Önemli olan onun için din.
  • More marked and less basic
• Din önemli onun için.
  • Possible in speech, but less neutral

For a learner, Din onun için önemli is the safest and most natural basic version.

It can mean him, her, or even it, depending on context.

Turkish does not usually mark gender in third-person singular pronouns.

So:

• o = he / she / it
• onun için = for him / for her / for it

You need context to know which one is meant.

This is very normal in Turkish and something English speakers have to get used to.

Yes, Din is the subject here.

It means religion.

The sentence is basically:

• Din = subject
• onun için = for him/her
• önemli = important

So the structure is:

[Subject] + [for him/her] + [adjective]

That gives:

Din onun için önemli.

Because din and dini are different forms.

• din = religion
• dini can mean his/her religion or sometimes religious in certain contexts, depending on usage

In this sentence, the speaker is talking about religion in general, so din is correct.

Compare:

• Din onun için önemli. = Religion is important for him/her.

• Dini onun için önemli. This would more likely mean something like His/her religion is important for him/her, which is a different idea and sounds less natural in many contexts.

Usually it means religion in general here.

Turkish often uses a bare noun without an article where English might also use a general noun:

• Din önemlidir. = Religion is important.
• Din onun için önemli. = Religion is important to him/her.

If the speaker wanted to specify a particular religion, the context would usually make that clear, or another word would be added.

Yes. That is also correct.

• Din onun için önemli.
• Din onun için önemlidir.

Both mean the same thing.

The version with -dir is often:

• a bit more formal
• a bit more written
• sometimes a bit more definite or assertive

In everyday speech, learners will hear Din onun için önemli much more often.

You would say:

Din onun için çok önemli.

Breakdown:

• din = religion
• onun için = for him/her
• çok = very
• önemli = important

So çok goes before the adjective:

• çok önemli = very important

A simple approximation is:

uh-nem-lee

A few details:

• ö is not exactly like English o
• it is a rounded front vowel, something like the vowel in some pronunciations of French peu or German schön
• li sounds like lee

So:

• önemli ≈ uh-NEM-lee, but with a Turkish ö

If exact pronunciation matters, the key challenge for English speakers is usually the vowel ö.