Well yes. Jesus is my Lord and Saviour- He owns me, He is my Master. but what denomination does that make me .. if any?
I think the person is also saying that baptism makes the sins go away, which isn't right. It's a sign of what has already occurred when we trusted the Lord Jesus for salvation. (The sense in the Greek is 'baptised on account of the remission of sins'.)
Yes, my local church is undenominational.
Blessings.