Do your investigation for rishtas. Ask the prospective people about their beliefs and share yours a well. If you’re not on the same page, then don’t pursue it. Much of the problem results with people not asking questions. You can’t just base your decision to marry someone on only looks, age, occupation, and salary. There is also lifestyle and compatibility to consider as well. And you ask other people their opinion of the prospective family.
Look, Zobi, you can’t change people unfortunately. The only thing you have more control over is yourself and your own actions and efforts. As far as guidance is concerned, scholars can advise. You can even refer to the Quran, hadith for guidance. Read a book, look things up on the Internet. Some people will wake up and mend their ways once they learn the truth. Other people…it may not make a difference how much you try to educate them…they will stick to practices that their parents/grandparents/great grandparents have followed for decades. And for others, they lose patience and hope with duas…and turn to peers and astrology and numerology and palmistry out of desperation/frustration.