[RnMomof7]

Bad example. Marriage seals in a sacred covenant. When it comes to salvation, it's faith that claims God's promise that seals in a sacred covenant, not baptism.

Eph 1:13 In whom ye also [trusted], after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,

[Campion]

Interesting verse. Here it is in a more modern translation (NASB):

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

So, in the early church, what happened to someone "after listening to the message of truth," and after they had "also believed"?

Yep. They got wet.