Perhaps next time you may want to address something actually found in my post. I can only assume that you must be mistaking anyone "speaking for all Christians" with anyone pointing to what is already there that outlines Christian belief.
Unlike Atheism with being a void, Christians have been blessed with tools for teaching, rebuking, correcting and training regarding Christian faith.
As for your mentioning people, you must also be confusing Who is the head of what. Christ is the head of the body, not the inverse where people dictate to God what Christianity 'should be'. If someone wants to call their self a Christian and has no fruit showing that the claim matches the foundation or demonstrates a life of contradiction, then that's sad for them. Hopefully a mature brother or sister will help them grow or rebuke them if a rebuke is needed. But it doesn't make their claim equal to or superior to what God has given us.
Besides, your claim(s) or implied above are simply that. Christ is THE way and THE truth and THE life. If people want to try to cast doubts, try to divide, try to say there are many ways, etc. - that rides along in the same boat as the example of anyone claiming to be a Christian, but the fruit doesn't match up.
1 Peter 2:6-8
6For in Scripture it says:
"See, I lay a stone in Zion,
a chosen and precious cornerstone,
and the one who trusts in him
will never be put to shame." 7Now to you who believe, this stone is precious. But to those who do not believe,
"The stone the builders rejected
has become the capstone," 8and,
"A stone that causes men to stumble
and a rock that makes them fall." They stumble because they disobey the message—which is also what they were destined for.
While there may have been some confusion on what you were replying to, the simple fact is that you can't really compare one mindset that is defined by a void as if it was in the same context of a faith that has a set foundation. I hope that clears things up a bit.