You are saved by grace alone in Lord Jesus.
That's it. We lost our relationship to God when Adam and Eve sinned, making us dead spiritually i.e. we have no connection to God who is Life. That is why Jesus came, He is the only one that can redeem us, He is the only way to Father, Heaven and Eternal life.
There is no other way. If you try to get there other way than by faith in Jesus Christ, who has done all the work on the cross, work that we are not capable to do, and He finished, then you are lost.
You will not get there by your efforts, nor your works and deeds, nor by anything you ever do, because there is nothing you can do. You, I and everyone else is in sin, and we all should have been in hell yesterday. Humanity should have ceased to exist/ be all in hell, the moment Adam and Eve sinned. God's grace postponed this judgement on humanity, so He could save some and reveal His eternal love and glory.
Baptism by water does nothing if you do not have faith. It won't save as anyone can get baptized by water. Same as circumcision in the OT. It did nothing if they had no faith. Abraham was called righteous by God when he believed God's promise and not when is circumcised himself.
Should we then get baptized by water? Absolutely. Why? Because God commanded it, but do it by faith in His promises and faith in Jesus, otherwise it's pointless. What about little babies? They must be raised faithfully by their parents.
God is all about the heart. Circumcise your heart as He says. The human heart is naturally very evil, it is like a stone in sin. That is why humans constantly sin and cannot stop. Because we are evil by nature. Look at the book of Exodus. God did all these wonders and yet the Hebrews complained all the time, and built a golden calf. Do not think we would have acted any different.
Or even worse, in the times of Jesus, He did all these miracles, and yet many did not believe, because there heart was sinful. There is a reason why God said that no one is righteous, not one, not one truly seeks Him, not one wants to do His will. There is a reason why God repent creating us in Genesis 6, because we are all evil and helpless. No one deserves Heaven. Therefore, it is God's grace that some are saved, not because the people who go to Heaven are any better that those in hell. And how He can save us and die for us despite all of this...I have no idea, but this is the true love of God we can't even comprehend.