For Marriage
It is not a suitable case and will lead to disputes. It should be abandoned.
For Business / Deal
It is bad; your counterparts intend to deceive you and will cause you harm.
وَلَن تَرْضَىٰ عَنكَ الْيَهُودُ وَلَا النَّصَارَىٰ حَتَّىٰ تَتَّبِعَ مِلَّتَهُمْ ۗ قُلْ إِنَّ هُدَى اللَّهِ هُوَ الْهُدَىٰ ۗ وَلَئِنِ اتَّبَعْتَ أَهْوَاءَهُم بَعْدَ الَّذِي جَاءَكَ مِنَ الْعِلْمِ ۙ مَا لَكَ مِنَ اللَّهِ مِن وَلِيٍّ وَلَا نَصِيرٍ
Walan tarda AAanka alyahoodu wala alnnasara hatta tattabiAAa millatahum qul inna huda Allahi huwa alhuda walaini ittabaAAta ahwaahum baAAda allathee jaaka mina alAAilmi ma laka mina Allahi min waliyyin wala naseerin
Never will the Jews or the Christians be satisfied with thee unless thou follow their form of religion. Say: "The Guidance of Allah,-that is the (only) Guidance." Wert thou to follow their desires after the knowledge which hath reached thee, then wouldst thou find neither Protector nor helper against Allah.