"Every baptized Christian (which is what makes one a Christian)"
Pardon me, but baptism doesn't make one a Christian any more than attending a particular church does.
A "Christian" is a person that has realized(by the intervention of the Holy Spirit) they are a helpless sinner that cannot save themselves from that sin. They recognize their sin separates them from God and they are fit only for hell. In Jesus Christ they perceive the only hope they have of pardon. So, by faith(also a gift from God) they put their whole trust in Christ (God the Son) and Him alone as the means to be saved from both the penalty and power of sin over them. As the old hymnn goes, "nothing in my had I bring, simply to thy cross I cling."
No ritual, like Baptism, makes one a Christian. However, once one has placed their trust in Christ alone, they will submit to Baptism because Jesus commanded it. A Christian will be obediant to their master (Jesus Christ). They will not be sinless, but they will strive to be so (repentance).
De fide Dogma:
Baptism is necessary for salvation. This is the Biblical and historical view of all of Christianity.
De Fide dogma. Period. Lights out. End of story. St. Matthew, last couple of sentences of the last chapter of the Gospel.