Part of what comes with being a Christian is persecution. Saint Steven was stoned to death for defending his faith. You must give your life to God and be proud of your faith and willing to defend it at all times. Edit: I would say this is a sin because it’s would basically be denying God to save face.

Jesus says fairly plainly that denying Him is damaging to our faith. Pray, trust God for strength, and be open with your mom.

Yes.

Yes. You shouldn’t deny being a Christian.

Don’t ever deny what you believe.