Allah..the creater..the sustainer..the benifecient..the merciful has revealed his final and d last book..the Quran..on his last and final prophet Mohammad (peace b upon him)..
Is it book by your GOD?
Read and know it what your Creater want from you..
If it is not?
Find any contradiction in it..
You will not find any contradiction in it (see chapter 2 al-baqra in Quran verse 21-24)..