the reason why consider December 5 as Christmas day is that

the reason why consider December 5 as Christmas day is that that day is the birthday of Jesus.
大概想表达的意思是 将12月5号视为圣诞节的原因是那天是耶稣诞生日.
然后,我不知道有没有什么语法错误,望英语好的人能指点一下哎,总觉得好奇怪哦.
For instance,a friend who is named Marry,she kept smiling and with some relaxed enthusiasm to everyone,finally,she getting along with everyone.
这句话，有木有神马语法错误呢？希望能再改一下。