Acts 2:21 niv says, “And everyone who calls on the name of the Lord will be saved.” What does it mean to “be saved”?

John 3:16 niv says, “For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.” According to this verse, how do we know that God loves us and wants us to call on Him?

We can't just call any number and reach God. John 14:6 niv says, “Jesus answered, ‘I am the way and the truth and the life. No one comes to the Father except through me.’” According to this verse, there is only one way to call on God. Who is that way?