I'm with the "positive commenters" here. There is so little that a person must believe to be counted in God's Family, meaning Saved. Bottom Line is "Christ and Him Crucified", as the Apostle Paul said in I Corinthians 2:2. But this could be unclear to unbelievers, so let me expand it a little.
Jesus Christ is the one and only begotten son of God. His DNA were planted in a virgin girl, Mary, who was "betrothed" (a fiance) to Joseph. And since the Old Testament Prophets said the Messiah had to come from the house of David, Joseph was of the house of David (actually Mary and Joseph were both of the house of David). God stated in His own voice twice, audibly, that Jesus was His Son. And since David was from Bethlehem, Joseph and Mary had to go to Bethlehem to give birth to Jesus, Caesar Augustus was used by God to force Joseph and Mary to go to Bethlehem (The City of David) to register for the census, hence the Christmas Story.
After Jesus ministered for three years, and fulfilled all of the Old Testament prophesies about Himself (The Messiah), He allowed the ruling Jews (with the Romans help) to crucify him as a propitiation (payment) for the sins of the world, past present and future. This was the final blood sacrifice needed by God, to cleanse the world of all sin, and it was part of their (The Trinity) plan before the world began.
However, just as with the Jews creating thousands of man-made laws, we today have made many of our own man-made laws. However, the foundation, "Christ and Him Crucified ", still holds for all true Christians, and that's all that is demanded of us in order to be Saved.
Now, I believed 90% all Christians will agree with what I have written, so far. However, to pull in the last 10%, of which I am one, I will add one more thing that will automatically happen when a Believer realizes what God/Jesus/Holy Spirit (The Trinity) has done for them, they will repent of their sins, and beg God's forgiveness. Repent is a ugly word, that we don't hear so much anymore, but I believe it is as applicable today as it ever was. Most of the time repentance happens before being Saved and sometimes afterward, but repentance becomes a way of life for true Believers, because we continue to sin until the day we die.