At least two reasons are possible for this.
Firstly, Jesus commanded it:
18And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. 19Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: 20Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world. Amen.
Secondly, both the love of God and sheer gratefulness for what Jesus has done for them, motivates Christians. People like to share good news.
The Muslims didn't learn anything from the christians because they where so cruel to the christians.
First off Muslims and Christians are not brothers/ sisters. Islam is a knock off of true Christianity. It is actually contradicting to the Bible even though there are some similarities to each religion. God may be the creator of both peoples (Christians and Muslims) but both Christians and Muslims serve a completely different God. Christians serve Christ and Muslims serve Allah. You can't serve to masters you'll either love one or hate the other. Islam premotes Death while Christianity premotes Christ. Christians should obey God and spread the gospel to Muslims so they can see the true light. When a Muslim converts to Christianity then and only then can they live together and treat each other as brother and sister because they live to serve the same God. See KJV Bible for reference.
Well, the principles should apply, if not the actual practice; the world has changed quite a bit since then.
It's not just Christians, it's people in general.
They ate too much pineapple and started seeing double...
How can you evangelise in your community.
Everyone should play it, not just christians.
Catholics are Christians.
Christians are saints. Saints are Christians.
They should be submissive to God.
The Celtic people are a race, not a religion. Most modern Celtic people ARE christians.
Martin Luther said that the Bible should be the only guide for Christians.
No christians should not wear , the skull and crossbones as they are the sign of the pirates. robbers at sea.
No - why?
It's important to Christians because WWJD is a reminder of how we should act as Christians and that we should think of how Jesus would handle a situation before doing something that is wrong.
Yes, Christians should most certainly take their problems to the Lord through deep prayer.
Ah, Christians aren't sad at Holy Communion, they are reverent, or should be.