In the Hymn to Amun it shows another form of Egyptian Trinity,
'All gods are three: Amun, Re and Ptah, and there is no second to them. Hidden is his name as Amon, he is Re in face, and his body is Ptah.'
Just because Christianity has a concept of Trinity, doesn't mean it had anything to do with the Egyptian Trinity. Many people through out the world had a Trinity, it is the number three. People also have significance for many numbers, especially those between 1 and 20.
So many things that people bring forward to show that Judaism or Christianity "stole" from Egypt or the multiple other cultures, are so weak or based on things that are just as unproven as the Bible or which have even less evidence of proof. Some similarities mentioned seem more likely related, but many others are not.
As for the similarities, how can the Teachings of God be stolen? The Teachings of God are for all Man and Woman.
Division is anti-life. Iron sharpeth Iron, each One Teach One.