**but it’s the faith that seals the deal**
Not always......
Or the faith of the parents and the godparents in the case of infant baptism.
I'm going to have to disagree with you here. I do not believe anyone's salvation is dependent upon someone else's faith.
Let me ask you thinks...say a baby is born and all relatives are killed in one fell swoop by an earthquake or some other disaster and then the baby dies. Do you believe God will address the needs of that baby's salvation, or are they damned because they lacked the relatives?
If you say God can and will provide for that baby's salvation then why do you believe in some cases God wouldn't and the salvation of that baby is dependent upon relatives?
Don't get me wrong, I'm not negating any value of relatives praying for a baby, but I believe it's God who saves, not the godparents.