Agree with Vince. It is the baptism of the heart which is more
important. Baptism ceremony is meant for human eyes but God's eyes
sees your heart. It is not the outward actions that matters.
As a personal opinion, I also encourage vegetarianism because
generally it is more healthy & not everyone has that type of
discipline.
I have Christian friends who asked me whether they should go for
Tomb Sweeping during Ching Ming & whether if they should eat
those altar food. My answer is "Go Ahead", It is the revelation
which matters.
Being Christian does'nt mean not being Chinese. We attend Ching
Ming because we miss our loved ones. Even if you have to carry joss
sticks, the Lord knows that your heart is for Him because this is
just a outward action & you do want to create conflict in your
family. Even for the altar food, to me it is just food.
It is sad that we often hear stories of people who did not care
for their parents when they were still alive but once their parents
passed on, they cry their hearts out at the funeral. It is about
the Heart my friend. God loves your parents too. If He blesses you,
He also blesses your parents & soon your parents will come to
see His loveliness & His goodness.