You have no evidence that the Bible was uniformly the same, and we know it was not because there are over 24, 000 manuscripts of the Bible and no two are identical.
That argument TRIES to imply that, because there are so many variants (over 150,000 to be precise), it is impossible to know what was originally being taught.
What you FAIL to share though is that nearly ALL variants are minor... a different letter, different word order, etc. For example:
Manuscript #1: In the beginning, God created the heavens and the earth.
Manuscript #2: In the beginning, God created the earth and the heavens.
Manuscript #3: At the beginning, God made the heaven_ and the earth.
Manuscript #4: In the beginning, Jesus created the heavens and the earth.
Manuscript #5: In the beginning, God created the sky and the earth.
Now, repeat this process on this passage for tens/hundreds/thousands of manuscripts, realizing that they all say essentially the same thing, and 85% or more of them are
nearly identical: In the beginning, God created the heavens and the earth.
You soon realize that the argument about "different manuscripts" is a tempest in a teapot. In fact, there is no tempest, nor is there a teapot. It is fluff, mist, a cloud without rain.
Your own Christian scholars said Mark 16:9-20 and 1 John 5:7 are false. In fact, these verses and others were thrown out in the REVISED standard version in 1952, which claims to go back to the oldest manuscripts.
And?
Then 32 scholars of the highest eminence backed by 50 cooperating denominations claimed the Bible had serious defects and they revised it AGAIN, except this time they put the verses that were thrown out back in it again because they were pressured to do so.
And Islam has not suffered the folly of "scholars"? Just look at Shiite and Sunni divisions that date all the way back to the time (nearly) of Muhammad. Why would you thrust "scholars" upon what I believe when you would NEVER dare do the same to yourself regarding the obvious scholarly divisions within Islam?
The issue isn't about what "scholars" say, rather the issue
is the Gospel.
Now, what about Muhammad's terrorism?