For a person with this position of Neptune, there is no clear ideological position, but there is an intuitive sense of the existence of a higher moral law.
As we already know, Neptune is a planet that develops our receptivity in us. Let's describe the situation: a person born in a certain environment absorbs the culture, traditions, religious values, and faith in which they grew up over time. After a while, they may find themselves in a different environment where there are different values and a different faith. The owner of such a Neptune will intuitively feel - whether this religion resonates with them or they want to run away from it, that is, they will follow the religious beliefs that resonate in their heart. For them, the presence of an inner state of peace is important. And they will not be able to stay in a church or another temple if they do not feel a sense of merging and dissolving in faith.
This position of Neptune can also be played out as a religion or belief adopted from grandparents: "I feel a part of these beliefs, it's mine," and they will observe all the rituals associated with this tradition, since they have boundless faith in what resonates with them. But they do not reject other religions either. The world is large and there are many religions in it. And they will not advertise their beliefs, and will not try to persuade anyone to accept their beliefs.
For a person with Neptune in the 9th house, moral values are more important than logical philosophical concepts. As they say, "As long as the soul is pure, and not the outer shell."
The ideological position of a person can be influenced by art - music, literature, or their spiritual mentor, or a person who inspires them.
Education... The owner of Neptune in the ninth house may show a tendency towards the humanities and creative disciplines. If there are no such inclinations, then there may be confusion, problems with education. And therefore, they may not finish their studies, or lose interest in the chosen direction - simply become lazy or change their life plans. There can be many reasons.
Foreign, distant trips... There may be troubles, confusion, as they may get lost in a foreign country, lose documents or money, run into scammers or deception. One needs to be attentive. But if your education and activity are related to Neptune and you went on a business trip for further training, then the planet works naturally and favorably here.
Also, a person with such a Neptune may have a craving for travel to exotic, mystical, or spiritually-oriented places.