Argue that your are preaching because you care and are trying to protect people from the hell fire.

 

[42.7] And thus have We revealed to you an Arabic Quran, that you may warn the mother city and those around it, and that you may give warning of the day of gathering together wherein is no doubt; a party shall be in the garden and (another) party in the burning fire.

[67.26] Say: The knowledge (thereof is only with Allah and I am only a plain warner