AS this girl is engaged in a Missionary Group , you must be aware of basic knowledge of both Islam and Christianity , otherwise she will be able to misslead you, they have been teaching the individuals who are involved in missionaries ,how to confuse Muslims and wash their brains by the ambigious expresions and vauge phases about mercy and Love of God in Christianity.
so, I suggest that prior to get involved in a conversation with her , you must get prepared for the debate,you have to do your home work ,assisted by the information as given by Dr. habib Nd Mr. Ahmad Al Araby,and you have at least should acquire satisfactory level of basic information which could place you in a strong position against her.
I would suggest that the main issues of your search for knowledge woul be in the following Agenda:
They will tell something like " Father , Son and the Holy Spirit are united in such a way that there is only one God,there is no three Gods as Muslims believe,and they can say that God is Plurality within Unity and Unity around Plurality .
they can further say that others also can not and are not able to understand the basic conception of the God as an infinte .
2- Salvation[Love and Justice
they believe hat " God is Love " and for so ,sins must be forgiven but justice demands that sin be punished ,and this discrepency needs to be solved this is an ill thoghts which led them to invent that forgiveness can not be granted and that creation made by God can not be redeemed by one less than God , and for this reason if there is to be any salvation for man it must originate from God,for God himself must pay the penalty,and that he is the only one able to do so because only he is infinite,and that because God can not punish himself in the form of God as this would not relate to man since he is the sinner ,it was inevitable that God became a man at a point in the human history to take upon himself
. the the due penalty of mankind's sin
you have to further reinforce your knowledge about hte following issues:
1-Old TestmentOld Testment includes more than plenty of issues which in conflict with the Bibles,although Jesus came to complete and not to alter as they say,it further contain criminal instructions to kill people other than jews brutaly in an unbelievable way,this is gravely contending with their allegations that Jesus " God " was killed on behalf of us to make atonment
it also contains clear information which describe our prophet pease be upon him.
2-Bible as a God revealed Book or man-written one
Their history is disgracing , at a time they had about 280 different Bibles and they held a meeting to choose from them the 4 known versions, it has to be emphasized that all Bibles are written after may be seventy years from Jesus raising to heaven and none of the writters were eye witness to the events nor seen Jesus,you also have to know that they do not posses any original manu******s contrary to their allegations,comared to Qur'an we have the same revealations written down and preserved directly from the
. prophet's own mouth
3- Differences Betwen Christian Factions
They differ in the core faith itself and not only in a secondry issues ,this is a big issue in which Orthodox are considering the Catholic for example as atheists and vice versa ,this is coming from each faction view about the nature of Jesus and if he is of one nature accomodating his "Divine " and "Human " forms or two natures ,they further believe in some ****s which other party has eleminated as judged to be inferior to God's words
4-Qur'an Scientific Miracules
Of course this is another issue , which is very important and there is hundreds of articles and books which you may read in this .
Dear Brother ,I have made an attempt to give you guidannce about some of the most important issues which you should reasonably learn prior to get dragged to a debate while you only has your good and strong belief ,this is not an easy task , they do lie to God from 2000 thosand years and they contiue to do and they have their devil brain washing means,So make your home work ,get prepared and then proceed .
God help you and help us