Confirmation is our personal participation in Pentacost, when we are clothed with power from on high and given the strength to boldly proclaim Christ, just like Peter and Stephen. Maybe this is what Sacratus is talking about.
Sacratus, is that what you mean? That you will be baptized and recieve confirmation at the same time, this Sunday? Are you in a Roman Catholic Church or an Eastern Catholic Church. I know that some Eastern Churches do baptism and confirmation at the same time.
If you sin after baptism, you drive the holy spirit from you. The sacraments are still valid and the Holy Spirit never fully leaves you, but the grace of the Holy Spirit no longer acts in your life and you have to confess.
-Tim-