I usually do not read what other Christians write in their books. It tends to be boring.
Yet, you claimed that, "As most unbelievers, you are most likely ignorant as to the definition of faith as it comes through to us over ca 2000 years. Your definition is probably as defined by atheists." You just said your definition of faith comes to you though Christians over 2000 years, yet now you say you don't read them? Where did you get your definition of faith then, if not from reading or listening to the teachings of other Christians.
A lack of motivation to listen to other Christians who have deeper thoughts into these things is no excuse. Laziness is not an excuse for you assuming these things came from atheists.
I read my Bible, and try to explain to those who have questions about the Bible how things are, end of story.
I chuckle when I hear Christians claim that it's the Bible telling them what it means. If you take someone with absolutely zero exposure to Christian thought coming to them that provides the backdrop and context for what they read on the pages, ie,, "This means x,y,z", you would have some very strange idea of Christianity that probably no one else on the planet would share with you.
It so pliable in fact, you have over 40,000 different denominations each reading the exact same text and concluded different schools of thought. Your ideas in fact reflect large swaths of Christian thought, and were not arrived at independently by you reading inside of some imaginary vacuum. What you conclude from what you read is heavily influenced by other Christians -- end of story.
Since my authority for what the faith should be is found in scripture, in the Bible, using a Harmonious Interpretation of All Scripture, it is possible to determine who is and who isn't an unbeliever.
No. All you have is someone who doesn't "believe" or rather agree with your group's reading of the scriptures. If that qualifies them as an "unbeliever", then you yourself are an unbeliever because you don't agree or "believe" in how they read it! That has zero to do with their faith in God. But when you brand them as an unbeliever in God, because they don't think and believe the same as you about God, then you are in fact in judging them in their relationship with God using yourself as the standard.
And that, is exactly why Jesus warned you about judging others. To quote, "Judge not, lest you be judged. For as you judge, you will be judged." If you judge another with yourself as the standard (which you are), then you will be judged using others as the standard against you. Then let's see how well that will fair for any of us. I prefer the standard to be the one Jesus set. It's pretty straightforward and simple, "By their fruits you shall know them". Not by how they think about God, or how they agree or disagree with you. It's much easier, and Christian, to not judge others.
Large latitudes must be given due to the number of churches that exist; so, while I personally may form an opinion, I am sure that the Lord Christ might be stricter than I am in who he accepts.
Quite exactly the opposite. Not stricter, but more loving, more generous, more graceful, more compassionate, and here it is.... more forgiving.
I find it quite telling that you view God as a strict parent with a harsh standard. When I read the NT, it tells us the opposite story. Spend some time reading Hebrews if you want to see how God is now to be understood as a God of Grace, versus strict law.
Legalism is the opposite of Grace. Legalism leads to you judging other Christians with your own "performance" as the standard. Legalism is what the Pharisees did in judging others as 'sinners' or 'unbelievers'. Then Jesus comes along and sets them straight in his welcoming the 'untouchables', whom they saw as unfit for the kingdom of God. That's the core message of the entire NT, actually. Not this "strict Jesus" distortion.
I belong to no church any longer. I am too demanding.
By "too demanding", do you mean harshly legalistic, and that you find the 'tolerance' of other Christians to be 'weak' and compromising of the high standards of the strict Jesus? I'm genuinely curious to understand this from your perspective.
Snake-handlers in particular, I frown upon. They are not holy in my book.
So you have your own book by which you judge others? Again, the standard of your interpretation of the Bible is the measure of another's faith for them?