We have a strong city; he sets up salvation as walls and bulwarks. Open the gates, that the righteous nation that keeps faith may enter in.
You keep him in perfect peace whose mind is stayed on you, because he trusts in you. (Isaiah 26:1-3)
Be you determined that if others do as they please, you are not accountable for their action; but you will do what you believe to be right.
If you are a Christian, go through with it; be a follower of Christ in every respect as far as the Word of God and your conscience lead you. I found that the habit of beginning to think for myself and to follow my convictions was useful to me, and it has been useful to me to this day.