While I am not Non-Denominational, allow me to join this discussion in fellowship, if I may.
Let's look at Mark 1:9, first in English, and then in the original Koine Greek.
Here we can see from Mark's account that Jesus was baptized. However, some may object, saying that the translation can also mean he was annointed. To settle this, we much look at the original Koine greek that the Gospel of Mark was written in. The following is an excerpt of Mark 1:9
If you look at the word ἐβαπτίζθη (pronounced ebaptiztha), you will see that it means "was baptized". This verb means to baptize and indeed it is the very verb from which the english word "baptize" arose! When looked at closely, there is no real leeway from interpretation. Jesus Christ was most indeed baptized in the Jordan River by John the Baptist.
I hope this has been helpful and not annoying.
God Bless,
Ceris