Ok let's analyze this! Gospel of John Chapter 10:30 which does say I and my Father are one but if we goes to the context in which sense did he say that. Lets analyze this.
Gospel of John chapter 10:23
Jesus walk into the temple of Solomon Porch and the Jews came around him and asked him, how long does thou make us doubt, if thou be the Christ tell us plainly, Verse 25 says: I told you but believe me not the work that I do in my Father's name they bear witness of me. Verse 26 says: you believe not because you are not my sheep as I said unto you.
The Jews they were asking Jesus Christ that why don't you speak plainly, so he tells them that I'm the Christ I have told you clearly but you're not my sheep you don't believe in me. Verse 27 continues Jesus say: my sheep hear my voice and I know them and they follow me. Verse 28 says: I give them eternal life no man can pluck them out of my hand and they shall not perish. Verse 29 says: my Father who's give it to me, He's greater than all no man can pluck them out of my Father's hand and verse 30 says: I and my Father are one.
Any person who are little bit tense can make out I and my Father are one doesn't mean that One as One person. It means One in purpose verse 28 says: Jesus Christ say, no man can pluck them out of my hand. Verse 29 says, no man can pluck out of my Father's hand. Verse 30 says, I and my Father are one. In purpose both Jesus and Almighty God, they are one in purpose. If I say that my father is a doctor and I'm a doctor and if I say I and my father are one. What does it mean? It means one in purpose as medical profession my father is a doctor and I'm a doctor, it doesn't mean that I and my father are one. It means my father is a medical doctor and I'm a medical doctor.
If we say ONE in actual unity. If we go ahead in Gospel of John Chapter 17:21
Jesus Christ says: Ye all of them are one, my Father in me and I in thy we all are one. Does it means that God Almighty is in Jesus Christ and Jesus Christ in his all 12 disciples, so there will be 14 Gods! Jesus Christ, God Almighty and 12 disciples. The same ONE is use here and there.
No! all of them God Almighty, Jesus Christ and apostles are one in purpose, again if we go two verse ahead John 17:23 says: that I am in thy and you are in me says the disciples. Does it makes all of them God? No. It means one in purpose.
Lets go ahead little bit more John 10:31 says: and Jews picked up stones against to stone at Jesus verse 32 says: for which of the good works of my father do you stone me verse 33 says: we don't stone you for any good work but because you blasphemy: being a man call yourself God that's why we stone you. Verse 34 Jesus answer: is it not mention in your scriptures that ye are gods and if the person to whom the word of God came, if he says God the scriptures are not broken.
Checkup in the Bible in Psalms 82:6 just says that: ye are gods
So Jesus Christ gave the answer to whom the word of God came, if you called him God it is not blasphemy, it is meaning that they are one in purpose.