The Trinity is a mystery. How can God be one in three or three in one?
Is it impossible that God can be three? No, God can be one, three or whatever He wants to be. So the problem is not whether God can be 3, but can we as mere people be able to understand God being 3.
The 2nd person of the blessed Trinity, our Lord and Savior Jesus Christ, seems to be the single biggest problem in the definition. How can a man be God? It is another mystery but not impossible to understand. A rather difficult to read but historical article on the origination of the term Homoousion or “God Essence” is here:
newadvent.org/cathen/07449a.htm
But it further complicated by the necessity of a savior dying for man for sins he did not commit. Or we are still under the curse of original sin committed by Adam. So God had to become a man, to die as a man, for a man that didn’t commit the sin.
It does seem the God had to jump through a lot of hoops. Be 3 in 1 in all of that too. But I am a Christian. Am I to believe all this or is there a simpler answer?
What if God forgave a repentant Adam? Would the concept of original sin still be necessary? Would God have to become man? Would He have die for my sins and those of Adam? Are all these things still required?
Is Jesus God? As for me, I believe He is. But is it hard to understand? I can see it from the Muslim perspective to be difficult. That’s why the Catholic Church is here to help with these issues. Jesus set up the Church with Peter to be the head. Jesus instituted Baptism to erase original sin. So after baptism the believer has original sin removed and all sins prior to baptism. After baptism there is confession for current sins. But is this all really necessary? Why can’t we just go to God and ask for forgiveness?
Sorry for ramble, but to wrap it up: Seems to me that the concept of God in Christianity is difficult, while the concept of God in Islam is easier? What am I missing? Am I dumbing it down too much? Why am I confused? Why wouldn’t God want to make it easy?