Why are there different Christian groups?

(In my opinion) many Christian groups agree on most of the central facts, for example, (in my opinion) many Christian groups agree on:-

• The authority of the Bible
• The Trinity (God the Father, God the Son and God the Holy Spirit)
• Jesus Christ is God the Son
• Man's inherent sinful nature
• Jesus Christ's life, death and resurrection
• Eternal salvation is only through Jesus Christ's sacrifice on the cross
• Heaven and Hell (that every human will either go to Heaven if saved; or to Hell if not saved)

But (in my opinion) differences between Christian groups have occurred over time due to how christians interpret different verses of the Bible.