So I read up on Horus and Isis and Osirus, what the heck I read it on Wikipedia.
Exactly what are the comparisons between that and Jesus??
The only link you seem to be able to make is Tertulian. Whatever he meant by what he wrote, it's hardly evidenvce that ALL early Christianity saw Jesus as a Sun-god. As Mazzgolf said, why the heck would a Jewish community wheel out old Egyptian mythology while they were all highly anti-pagan. Religious leaders would cerimonially bath themselves after coming from the market place because they felt contaminated by gentile people they had dealt with.
Possibly because Egyptian Theology is a highly advanced and sophisticated spiritual philosophy uncharacteristic of the intellectual primity of mankind during that age. Their social conventions, architectural skill and the general breadth of knowledge of worldly phenomenal information was abnormal by historical standards.
Additionally, their theology which precedes Judeo/Christianity involves a creator god, a savior god and a spirit god and multitude of lesser gods, including a devil and cohorts which in similar symbolic imagery are defeated in the same way portrayed in Judeo/Christianity. They are congruent in the afterlife and the belief in Heaven and Hell as well as the importance of high moral standards, such as demonstrated by the law and the teachings of Christ.
If that weren't enough evidence of influence, it is arguable that the very roots of western philosophy originated in Egypt.