For Marriage
The morals and culture of the families do not match. Settle all your conditions and talk clearly from the beginning; otherwise, it is better not to proceed.
For Business / Deal
It is not as great as they claim. Mind your own business and withdraw from this transaction.
وَقَالُوا كُونُوا هُودًا أَوْ نَصَارَىٰ تَهْتَدُوا ۗ قُلْ بَلْ مِلَّةَ إِبْرَاهِيمَ حَنِيفًا ۖ وَمَا كَانَ مِنَ الْمُشْرِكِينَ
Waqaloo koonoo hoodan aw nasara tahtadoo qul bal millata ibraheema haneefan wama kana mina almushrikeena
They say: "Become Jews or Christians if ye would be guided (To salvation)." Say thou: "Nay! (I would rather) the Religion of Abraham the True, and he joined not gods with Allah."
