No...no I looked in the mirror this morning and I'm not “invisible”. I've been sealed with the Holy Spirit as belonging to God.
Eph. 1:13,14, In Him, you also, after listening to the message of truth, the gospel of your salvation-- having also believed, you were sealed in Him with the Holy Spirit of promise,
who is given as a pledge of our inheritance, with a view to the redemption of God's own possession, to the praise of His glory.
One enters the Church visibly through baptism, and keeps membership visibly by taking the Holy Communion during Mass.