In Jain Dharma, marrying a non-Jain is not automatically a sin.

What matters most is:

• your conduct
• your commitment to ahimsa, satya, aparigraha
• whether your Jain vows and religious practice remain strong

A marriage itself is a social and personal decision. Jain teachings focus more on karma, conduct, and restraint than on simply the religion of the spouse.

However, from a Jain perspective, it is important to consider:

• Will your daily observance of Jain principles remain intact?
• Will you be able to follow pure vegetarian / strict Jain food discipline if that is important to you?
• Will your family life support religious values, simplicity, and non-violence?
• Will there be respect for your faith, fasting, temple practices, and sacred observances?

So, it is not inherently a sin, but it should be approached with wisdom, honesty, and dharmic intention.

If the relationship helps you live more truthfully, peacefully, and ethically, it should be judged by those qualities. In Jain thought, karma is shaped by intention and action, not merely by labels.

If you want, I can also explain this from the viewpoint of Digambar and Shwetambar traditions.