You are correct that over the centuries, people calling themselves have owned slaves, murdered in the name of god, Engaged in forced conversions, burned heretics, etc.
It is impossible, however, to find support or justification for these crimes in the words or life of Jesus.
Jesus said in Matthew 10:34: "Do not think that I came to bring peace on the earth; I did not come to bring peace, but a sword." If you read that entire chapter, it is very enlightening.
The sword in scripture, besides its literal meaning, refers to the word of God.
"And take THE HELMET OF SALVATION, and the sword of the Spirit, which is the word of God. (Ephesians 6:17)
"For the word of God is living and active and sharper than any two-edged sword, and piercing as far as the division of soul and spirit, of both joints and marrow, and able to judge the thoughts and intentions of the heart.: (Hebrews 4:12)