TV's Frink said:

Yes, but the ceremony they get in the afterlife is unnecessary for anyone but the living. The dead can have a ceremony given to them by the dead, or by Jesus, or whomever.

In fact, you could argue that a baptism is entirely unnecessary for the living as well. If God can indeed look into my heart and know my innermost thoughts, would he not know that I had accepted Christ as my savior? Why is there this need to declare it in public?

I agree.

Of course, being non-religious myself, I think the way I live my life and treat others is much more important. If there is a God, and this God is truly above mortal emotions like pride and jealousy, he/she would not even care if I didn't believe in him/her. He/she would only care about how I lived my life.

God's not above mortal emotions. God is described throughout the Bible as being a jealous God (an trait that even some humans have managed to overcome).