They impress on thee as a favour that they have embraced Islam. Say, “Count not your Islam as a favour upon me: Nay, Allah has conferred a favour upon you that He has guided you to the faith, if ye be true and sincere.
Islam in itself is a precious privilege. By
accepting it we confer no favour on its preacher or on
any community. If the acceptance is from the heart, it is
a great favour done to those who accept, that the Light
of Allah has entered their hearts and they have received
Yusuf Ali, Abdullah. Translation and Commentary of the Quran. (surah 49 verse 17. Quran Arabic with English Translation & Commentary (Tafsir) by Abdullah Yusuf Ali, Free Download (quran4u.com)