You have to be ready to give an answer when you’re asked about what you believe Jude 1:3

We explained the trinitarian nature of God

1.⁠ ⁠God is one

2.⁠ ⁠⁠God is three distinct persons

3.⁠ ⁠⁠each person is fully God

The Muslims believe that Allah is absolute and he is one and there’s no division in God.

But in Christianity, we still hold the fact that God is one but what differs is that we believe that he is not just One but he also exists as three different persons, God is one in essence and three in persons.