There is no sin in bathing. Those who see it are projecting their own sins upon innocence, just as priests are disproportionately sexual abusers of innocent children. If one lives in fear, they will make themselves sick and they will sin, though if one lives in innocence and caring decency out of instinct, there need be no sin. The battle to fight is not so much about sin, but about environments which cause sin, i.e. that which cuts us off from life and all that was once good. The culture has now been decimated and so sin thrives, but that is a result of the cultural destruction and not a result of sin itself.
Sin emerges out of a lack of belief in the possibility of positive outcomes.
Spirituality is one's connection to life and the totality of all things. Religion is the routine of ceremony and worship according to fixed principles and values created by those who define the social order of that following, typically a church. I do not think a church or any other outside source can tell someone what their spirituality is or should be - that is for the individual to discover. Furthermore the structure of religion is often an impediment to legitimate spirituality because it attempts to confine it within its own definition, thus killing the spirit that one is and seeks. I am comfortable with my relationship and understanding of God and fear no retribution for being what I am.