Converting to Islam to marry a girl

Q: My daughter wants to marry a Christian guy who says that he wants to revert to Islam. I am so upset and really do not know how to handle this situation and really need advice on how to move forward.

My daughter said that he already took the shahada and is currently reading the Quraan, but I dont know if this is true and is he just doing this for her or does he really want to revert to Islam for the sake of ALLAH. How do we react to him and his parents and what should we do?

My daughter said that if we can find a good Muslim boy, she is willing to give him a chance, but I think she is just saying that to make us happy.

Performing salaah or reciting Quraan with a small amount of impurity on one's clothing

Q: If a najaasat-e-ghaleezah that is thin and flowing falls on the body or clothes, it will be excused if the area on which it falls is equal to or less than a fifty cents coin in extent. If the person performs his salaat without washing it off, his salaat will be valid. But to refrain from washing it and to continue offering his salaats in this way is makruh. If it is more than a fifty cents coin, then it will not be excused. Salaat will not be valid if it is not washed off. Beheshwati Zewar (pg 44).

Does this include mazi?

What is meant by makrooh (disliked or sinful)?

Can I still read quran?