Hello MyrtleTrees, you will have trouble finding complete agreement (and sometimes finding anything close to that) on most of our online Christian forums, just FYI, as there as so many out here who hold to & press an unorthodox understanding (of part or of most) of the Christian faith. There is one forum that comes to mind, The Puritan's Board, but to join that forum you need to have credentials (you need to tell them which Reformed church you belong to, and which Confession you adhere to, etc.), because they are all there to discuss the various aspects of the Reformed faith, not to spend thousands of hours discussing whether the Reformed faith is true or not.
That said, there are a number of other Christian forums from which to choose, so go check them out if you'd like to (I believe christianforums.com is the biggest/most active board these days, just FYI, but like I mentioned above, the diversity of beliefs there is just as big or even bigger than it is here).
The other thing is, if you know the truth, why not stay and continue to share it with those who do not 
You can post on two different forums too, of course
Finally, I have found that this format (Christian online discussion boards) leads to misunderstandings between people who believe the exact same things many times, because what is meant by one member is oft times misunderstood by another member (because many of us have such different understandings of the common terminology we use, and we all tend to express things in different ways as well, and that with no help from vocal inflection or facial expression like we would have if we were talking to each other in person). I try to figure out better ways of communicating with others online, and things have gotten a bit better over the years as a result I am happy to report.
So, I guess what I'm also saying is that your beliefs may lie closer to what others believe than you know
God bless you!
~Deut
Thanks so much for your comments here! Thanks for the suggestion of the other Bible discussion sites to try out. I found one in facebook too that has reformed type people in it. I decided to continue posting in here, but to do things differently. I don't want to waste time and energy reasoning with people I already know are opposed to what I believe in. So will state that I will only reply to those who agree, so that I don't disappoint those who expect a reply when I don't want to reply to them. And make them go to the bother of replying to me when I don't plan to reply to them. That's what I've thought of so far, as to how to handle the problem.
What do you think of that?
I thought through the subject a lot through the night and this morning on Bible examples of how to deal with people and believers who don't agree on Bible subjects. I gained some wisdom through thinking it through, I believe. I remembered how Jesus spoke to crowds often - but only spoke directly to those that He knew were really willing to understand what He had preached about. I can see the wisdom of that method, in online Christian forums, too. I also thought of how the Bible says we are to be peace makers, and how we are not to be contentious (argumentative). Reasoning with others is good, and explaining Bible truths to people who may not understand them is good, according to examples I see in the Bible. Jesus and the apostles did a lot of this. But when it becomes arguing - it's time to stop, as the scriptures forbid this. And when it becomes clear that someone really doesn't want to hear my point of view on a Bible subject - I should stop discussing it with them. It is a waste of time and energy, and also not pleasing to God. Here's one verse I found that seemed pretty good as to how to handle those who don't agree on spiritual things, in the church of God on the earth:
2 Tim 2:24-26
24 And the servant of the Lord must not strive; but be gentle unto all men, apt to teach, patient,
25 In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth;
26 And that they may recover themselves out of the snare of the devil, who are taken captive by him at his will.
KJV
God bless you, too!
1
