Learn English – I am extremely interested in doing something

According to the Cambridge Dictionary, raise means to cause to exist. It also says that express means to show a feeling, opinion, or fact.

The difference is that raising is generally about creating something new, whereas you can express concerns about just about anything, including things that are already in the public domain.

So, I could express concerns about global warming but I could not raise them - everybody already knows about it. On the other hand I could either raise or express concerns about the possibility that a meteorite recently observed by my team might collide with the Earth - in this case I can use raise because nobody else knows about the meteorite or its path.

In your case, if somebody else has already raised these doubts, you can only use express. If you are the first group to identify them, then you can use either express or raise.

No, you cannot say "I am scoring somebody" to mean that you are building favor with them.

The verb "score" with a direct object other than "point" or "goal" can mean to cut shallowly with a knife. To "score with" can mean "have sex" so it might be appropriate with your girlfriend, but probably not with your boss.

As you guessed, "score points off of somebody" has an argumentative connotation.

"Score points with somebody" has more of the meaning that you're going for.