I am a building materials supplier and I got a tender from our government to supply materials on demand to build a temple. But I am not sure if this is haram or halal?
Surah Al-Maidah , Ayah # 2:
تعاونوا على البر والتقوى ولا تعاونوا على الإثم والعدوان
Cooperate in righteousness and piety, but do not cooperate in sin and and transgression
Building a temple where shirk happens and idols are worshiped is sin and transgression. Shirk is actually the biggest sin.