Try this:
Go to contacts, click settings and take a look at contacts to display. I'm not sure if this will only effect contacts listed here or here and in the text app.
I can't find a way to edit only contacts in the text app.
Might be worth a shot.

 

Is the issue duplicate entries? I found this to deal with duplicate entries, posted by Jaaay9 (he asked that his name be quoted):
Right I have solved this problem. This problem is a well known problem that everyone has and I have yet to find a solution that works on the net. After much trail and error I have the solution to this.

What you need to understand is Samsung S2 has a display feature which shows all contacts from Sim, Phone and Google account and these act as a 3 separate shortages. These can be switched off individually only at the CONTACT menu.

However, the text messengering menu sees the 3 shortage accounts as 1 storage unit. Hence why it sees duplicate contact names.

To solve this I would advise a back up of the numbers be made first. Either on Sim card or on Google account. For this example I have backuped my contact on sim card.

Go to the contact menu and switch off display to Sim card. This will hide the contact on the sim card and only show contacts under phone and google account. Delete the duplicates (Phone and Google contacts) from the contact menu. You won't be deleting sim card contacts as this is hidden.

Go back to the account screen, turn OFF display from Phone and Google and turn ON display from Sim Card.

Go back to the text messengering menu and duplicated contacts will be gone. You will only be left with the contacts displayed on your sim card.

In essence only 1 storage feature (Sim, Phone Or Google) should be displayed. Unless you have different contacts for each shortage unit.


I hope this helps and quote my name when referring this to elsewhere.

If that's not the issue I think it might be time to look at other texting apps.

 

I understand, I was hoping the reason you only wanted to see Google contacts was because when you saw both there were duplicates.
I'm sorry to say I've exhausted all my ideas on how to help. Perhaps one of the greater minds will be able to help or suggest a texting app that will allow you to do what you want.
Sorry