Even though there are often a variety of ceremonies associated with Baptism, such as blessing and naming rituals in churches which baptize infants, or personal testimonies given before Baptism in churches which Baptize only older individuals, or gifts like a white garment or a burning candle given in recognition of the event and its meaning, such things are not a requirement of a valid baptism. So, for example, when baptizing an infant in an emergency situation, I may include nothing more than applying water to the child with the words, "I Baptize you in the name of the Father, and of the Son, and of the Holy Spirit. At other times, only the Apostles’ Creed and the Lord’s Prayer might be added, and some of the previously mentioned ceremonies delayed until the Baptism is publicly recognized in the Sunday Service, but as long as these two elements are present--water and God’s Word, particularly the Triune name--the Baptism is valid, and we can say with confidence that it has done what God has promised.
Baptism is almost universally understood to be the means of entry into the Christian congregation and the boundary between those inside and outside of the Church. In recognition of this, traditional church architecture often places the baptistery at the entrance to the church building so that one passes it every time they enter the worship space. However, Pastors and Biblical Scholars would rarely describe Baptism as “required” as something we must do in order to be saved. Instead, they might choose terms such as “necessary” without being “absolutely necessary.”
One reason for this is because for a person to claim to trust Jesus, but then refuse to receive the Sacrament He commanded would be extremely inconsistent. More importantly, though, since Baptism is not primarily something the person does as an act of devotion to God, nor is it merely something the priest/pastor does for the person. Instead, Baptism is something God Himself does for the recipient, by the hands of the pastor or priest, and if the person refused to receive the Sacrament through which God has promised to deliver His blessings, then it would necessarily raise questions about their profession of faith.