Do not insult those they invoke other than Allah:

 

﴿وَلَا تَسُبُّواْ ٱلَّذِينَ يَدۡعُونَ مِن دُونِ ٱللَّهِ فَيَسُبُّواْ ٱللَّهَ عَدۡوَۢا بِغَيۡرِ عِلۡمٖۗ كَذَٰلِكَ زَيَّنَّا لِكُلِّ أُمَّةٍ عَمَلَهُمۡ ثُمَّ إِلَىٰ رَبِّهِم مَّرۡجِعُهُمۡ فَيُنَبِّئُهُم بِمَا كَانُواْ يَعۡمَلُونَ١٠٨﴾ [الأنعام: 108]

«And do not insult those they invoke other than Allah, lest they insult Allah in enmity without knowledge. Thus We have made pleasing to every community their deeds. Then to their Lord is their return, and He will inform them about what they used to do(108)»