(Off-topic posts, removed from Traveling from US to Ukraine )
I would point out that the word "fundamentalist" often has negative connotations today, but the word was originally coined by American Protestants who wanted to AVOID fighting and hatred between Christians -- they hoped that believers in Jesus could agree about the "basic fundamentals of Christian theology" (that Jesus of Nazareth was the Son of God, that Jesus was physically resurrected after the crucifixion, etc.)...
...while "agreeing to disagree" about non-fundamentals (the precise forms of rituals; the exact phrasing of prayers; whether a baptized person must go completely under water or if "sprinkling" water is sufficient; whether women can be pastors; etc.).