The Church defines spirituality and religiousness as follows -
Spiritual - “The life of the Holy Spirit, dwelling in the souls of the faithful and enabling them to praise and love God and serve him in the practice of virtue. It is called the spiritual life because: 1. its animating principle is the Spirit of god, the “Soul of the soul” in sanctifying grace; 2. it is the supernatural life of the human spirit; 3. it is mainly lived out in the spiritual faculties of intellect and will, although affecting the whole person, body and soul.”
Religion - “The moral virtue by which a person is disposed to render to God the worship and service he deserves. It is sometimes identified with the virtue of justice toward God, whose rights are rooted in his complete dominion over all creation. Religion is also a composite of all the virtues that arise from a human being’s relationship to God as the author of his or her being, even as love is a cluster of all the virtues arising from human response to God as the destiny of his or her being. Religion thus corresponds to the practice of piety toward God as Creator of the universe.”
as you can see, they really work hand in hand, and you cannot really have one without the other, at least in the Catholic sense,
and the main aspect of either spirituality or religiousness, is virtue, and love of God, both of which, again, you cannot have one without the other.
going to church really doesn’t make one “religious” or “spiritual”, because not everyone who goes to church is going out of love for God, many go merely to fulfill their Sunday obligation, and many go without really knowing exactly why…and then some cannot go to church, for whatever circumstance, especially in areas of religious persecution, and yet they can be just as or even more religious than those who do go…
but the true spiritual and religious life, which work hand in hand, are lived mainly on the inside, and the reason for that can be found by reading the first epistle of Saint Paul to the Corinthians “If I speak with the tongues of men, and of angels, and have not charity, I am become as sounding brass, or a tinkling cymbal. And if I should have prophecy and should know all mysteries, and all knowledge, and if I should have all faith, so that I could remove mountains, and have not charity, I am nothing. And if I should distribute all my goods to feed the poor, and if I should deliver my body to be burned, and have not charity, it profiteth me nothing.”
Charity is the love of God, and it is God Himself, and although we may be motivated by charity outwardly, charity is interior, it is the infused supernatural virtue by which a person loves God above all things for his own sake, and loves others for God’s sake, and it is the foundation of all things, because if charity is God, and God is charity, than to have charity is to have God, and to have God is to have all things.
well, i hope that makes sense, take care.