Christianity as a religion has blood on its hands.
In the broader sense, sure. Christianity is a religion and there have always been people willing to kill on account of religions. You really think there's never been a Muslim murdered by an angry Hindu? Or a Christian convert murdered by a local angry Hindu?
You do realize there's like 100-200 hundred million people in India who live their entire lives regarded as trash because their religion said they were born trash. It took Western (*cough* Christian *cough*) influences to formally abolish this perverse system but even today many Hindus take it seriously.
As a theology it portrays the God of the bible as a genocidal lunatic.
And I suppose the Hindu gods never killed anyone?
it fails scientific scrutiny. Science, archeology demolishes the events of the bible such as the Exodus, Noah's flood and Jerico as totally fictional.
And I suppose everything in Hindu scripture is scientifically accurate?
Jesus was rejected by the Jews
The Bible's pretty clear that people choose whether to accept or reject truth. The Jews rejected Jesus and that was their own failing.
the very people he was sent to save.
Yes and no. The Gospel was proclaimed "first to the Jews" but "then to the Gentiles". As a universally applicable narrative it would make no sense to offer salvation only to those members of a single small ethnic group.
The Romans crucified Jesus and to add insult to injury established The Roman Catholic Church to displace Judaism the religion that Jesus followed.
The church was institutionalized, yes. But Christianity was about 280 years old by this point.
There are 30,000 denominations of Christians because their religious leaders disagreed with the interpretation of the Bible.
This reflects the choices and shortcomings of people, not of God. At the same time, though, these "30,000 denominations" agree on 80-90% of stuff. The core doctrines of the Christian faith are accepted by all of these save maybe the Mormons and similar fringe groups.
It is impossible to die for the sins of others.
Says who? You? You can't, sure. You're a fallible human being with your own sins to pay off. But God, without blemish, the Creator of the Universe? I don't see why not.
It's important to note also: there are varying interpretations of what Jesus accomplished on the cross. The common view is simple atonement, but in keeping with the larger Biblical narrative Jesus is also described as a conquering King who was mighty enough to redeem men from the hold of sin. The cross, while atoning, also served to demonstrate God's infinite power and love.
Human sacrifice was banned by the God of the Bible.
Jesus is God, not a mere man.
Also, what do you think God meant? "Do not murder people/needlessly throw away their lives in vile pagan rituals" or "I will arbitrarily limit myself from accomplishing what I seek to accomplish, the redemption of humanity, because that interpretation of my words is the one that will make some smug guy on the internet thousands of years later sound right"?
Anyone can do what you're doing: take the words of a religious text and twist them to mean things the original author never had in mind. The fact that it is grammatically possible to so twist words does not in itself discredit anything whatsoever. It merely reflects limitations of human communication. Otherwise, anyone could do the same to Hindu texts and thereby discredit Hinduism.
Jesus was not sacrificed he was crucified.
So they tried to seize Him, but no one laid a hand of Him, because His hour had not yet come.
(John 7:30)
"Put back your sword," Jesus said to him. "For all who draw the sword will die by the sword. Are you not aware that I can call on My Father, and He will at once put at My disposal more than twelve legions of angels? But how then would the scriptures be fulfilled that say it must happen this way?
(Matthew 26:52-54)
So Pilate said to him, "Do You refuse to speak to me? Do You not know that I have authority to release You and authority to crucify You?" Jesus answered, "You would have no authority over Me if it were not given to you from above.
(John 19:10-11)
Yup, sounds rather voluntary to me.