Yoga teaches good living in this life. Christianity teach the only way to everlasting life, through Jesus.
How would you know what yoga teaches if you have not even read a single book on yoga?
And moreover, how would you know what Jesus taught if you have only read 4 of 28 gospels?
And what is a Christian?
The action that makes one a Christian also make one a member of Christ's church.
What is that action? My conclusion, which may be different from yours, is that it is found in Luke 13:3
"And you will perish, too, unless you repent of your sins and turn to God."
Therefore, the way to goodness and life comes through repentance and obedience to God. Nowhere in the Bible does Jesus say that the way to goodness and life is "through me, Jesus". In fact, he says that "God's Kingdom is not here (i.e. within Jesus), and it is not there (i.e. somewhere else); GOD'S KINGDOM IS WITHIN YOU". So repentance and forgiveness must begin within self, for that is where God resides--within YOU!