Only Baptists baptize

Uh, can you clarify what you mean by this?

Only Baptists baptize

No, absolutely not. Baptism is arguably the most important sacrament for all christian churches! Where I'm from, the catholique baptism is typically done for babies by gently pouring water on their forehead. Ofc it's less spectacular than the "full immersion" baptism by the Baptists (also used by the pentcotalists as well btw).

But anyway, none of that make sense to be done in a parking lot. Reading the other comments, I like the idea that the dude got suddenly touched by grace after eating a gross fish meal at Cracker Barrel!

I was baptised in the Church of England.

Baptisms aren't just a Baptist thing, though they generally put more weight behind it than most other denominations that do it. At least from what I've seen.

I was Pentecostal growing up, and a few times a year- generally around Christmas and Easter- they'd do an open baptism and anyone who wanted could get dunked. I went to one church without that big tub behind the pulpit you're talking about- they'd do it in the river nearby. Cold as hell in the winter.

Basically every brand of Christianity that I'm aware of has some form of baptism, though the exact way it's done varies a lot.

Matthew 28:19 is, "Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit"