When you believe in the resurrection of Jesus it is by revelation from the Holy Spirit. At that moment the Godhead lives in you.
The Godhead lives in you from the moment of your baptism. Appropriating that life is a lifelong journey and a day-by-day choice.
So from then on Jesus is always in you. We receive Him by faith and He sticks closer than a brother. It is something that God Himself chose to do in us. On the other hand I know many Catholics who received baptism, communion and confirmation and yet don’t believe in the resurrection.
The fact that you know Catholics who do not believe in the resurrection (I don’t) has nothing to do with the teaching of the Church or the action of the Holy Spirit.
The Eucharist is a sacrament; an outward sign of an inner belief.
They are not
merely signs. Catholic and Orthodox teaching on the Sacraments is that Sacraments are EFFECTIVE:
1127 Celebrated worthily in faith, the sacraments confer the grace that they signify.48 They are *efficacious *because in them Christ himself is at work: it is he who baptizes, he who acts in his sacraments in order to communicate the grace that each sacrament signifies. The Father always hears the prayer of his Son’s Church which, in the epiclesis of each sacrament, expresses her faith in the power of the Spirit. As fire transforms into itself everything it touches, so the Holy Spirit transforms into the divine life whatever is subjected to his power.
1128 This is the meaning of the Church’s affirmation49 that the sacraments act
ex opere operato (literally: “by the very fact of the action’s being performed”), i.e., by virtue of the saving work of Christ, accomplished once for all. It follows that "the sacrament is not wrought by the righteousness of either the celebrant or the recipient, but by the power of God."50 From the moment that a sacrament is celebrated in accordance with the intention of the Church, the power of Christ and his Spirit acts in and through it, independently of the personal holiness of the minister. Nevertheless, the fruits of the sacraments also depend on the disposition of the one who receives them.
It is a celebration of the life of Christ that is already in us.
Not in Catholic teaching; for us the Eucharist is a participation in Christ’s death and Resurrection.
If I receive bread and wine in a Protestant Church Jesus is with me there also.
Aside from the detail that you are enacting a contradiction, Christ may be present in Protestant celebrations of the Lord’s Supper but not by any means in the way He is present in the Sacraments of the Apostolic Churches.
I don’t have a problem with it. If someone thinks that’s not right I’m sure you will try give me a problem that I don’t have and don’t need. It’s been done before.
I certainly hope you do not consider my posts as ‘giving you a problem.’ You might enjoy a quiet and meditative read through the *Catechism of the Catholic Church. *Get the green version and read it straight through (or you might want to begin with part 4 and then go through 1, 2, and 3. You seem to have received painfully defective catechesis. You are not alone.