This is a question a person asked me. How would you have answered?
While the only answer from Christianity is "No", I would point out why Christianity requires believing Jesus is the son of God, the door of salvation from sin to eternal life with God. World religions apart from Christianity present many other claimed ways of some concept of sin/original sin and some measure of improvement, most emphasizing personal strengths, self efforts, or strict adherence to exterior factors such as a set of laws which are often the basis of a whole culture.
Judaism is a religion of works, so is Buddhism, Hinduism, etc. Christians believe (supposed to) there is no possibility of pleasing God concerning salvation from our sinful inner self by way of works alone, which sets faith in Christ as highly opposite most of the world's beliefs. Knowledge of world religions has been only recently become common knowledge among students, so inability to deal with those is a hindrance to effective evangelism among them if they bring it up.
All choose a path of some kind to some final end. According to the Bible relatively few will take the narrow path of Jesus, while most will plunge off the end of the wide path most choose.
It might be helpful to start a conversation about their concept of "salvation" before giving the "No" answer. Saying "No" initially closes doors to dialog that could allow the Holy Spirit to speak to the inquirer through your presentation of the gospel of Christ, beginning with why all need salvation through faith in Jesus Christ.
Another angle to explore is their reason for thinking water baptism has any power of itself, for what purpose, while there is possibly in their thinking no valid reason to even believe in sin or a sin nature or punishment for sin, or eternal life for that matter. A Buddhist that only knows about Buddhism would not anticipate the Christian perspective of sin and a need to deal with it. They have to be told. These days it's a good idea to have some basic knowledge of world religions to allow you to give a comparative religion position when dealing with people under about 40 years old, especially those with a few years of college recently.
An effective tool for evangelism is what I was taught as "Verbal Judo", responding to a challenge of words with first an intelligent acknowledgement of a statement followed by a deflection to an appropriate Bible doctrine. That requires being able to instantly give a reason for the hope you have in Christ alone, hopefully in the context of a discussion.
IOW, a simple "No" is likely to drive people away, thinking you are too ignorant to get answers out of.