> I try to get the structure of a site including ONLY
> the index.html in each folder.
> Here is what i tried until now:
Don't tell us what you think you did, post exactly what you did do (log file
line two)

> httrack sacred-texts.com -*.sacred-texts.com/*.htm*
> +*.sacred-texts.com/index.htm* 

You're mirroring "secred-texts.com" so those two filters do not match
(*.secred)
 
> Filter
> -*.gif -*.jpg -*.png -*.tif -*.bmp
> -*.zip -*.tar -*.tgz -*.gz -*.rar -*.z -*.exe ...

All unnecessary:
httrack sacred-texts.com -* +*/index.htm