The Orthodox don't thump our Bibles, we kiss them
Extremism and fundamentalism is avoided by being aware of them, and aware that we are most susceptible to them in the beginning, when we discover something new (like Orthodoxy) and then throw ourselves zealously into it. It is like the attitude of a first-year undergraduate science student who, after having left school at 18, thinks he knows almost
everything. Just a few more years at university and he will be an "expert" -- this is what he thinks.
Of course, after 3 years he realizes he knows nothing at all. Why? Because in going to university he has expanded his horizons and seen the expanse of his discipline unfold before him; he has seen how much there is yet to know, how much "old" knowledge there is left for him to digest before he can even begin to add
anything to his chosen field. In learning more, he has done nothing more than expand the boundaries of his ignorance.
This is the case with intellectual knowledge. Orthodoxy is a life, yet there are parallels with the 1st year student. When I first began to learn about Orthodoxy, and experience some of her "life" (the church services mainly) I was very attracted by it all, because finally I could see the Truth, and I could see my destination. But I was far off then, and so I could see it all in my field of vision. Now, having entered Holy Orthodoxy, I realize I know nothing about it. Worse, what I do know, I don't practice. I see the life of the Church, her saints (canonized or not) and realize I fall far short. So all I can do is beg for mercy, and gradually be healed, knowing, as the desert fathers say, that the more I am healed, the more I repent, the more sins - previously hidden - come to light: and so the more sinful I realize I am. But despite all that I can still be grateful I'm not that idiot before who thought he almost knew it all.
If you can get the hang of that I don't see how you will become one of those extremists who puts down others.