Abraham believed God "by faith" and that was accounted to him as righteousness. It's always been the same, God requires "faith". I suggest you read Hebrews chapter 11 for many examples from the Tanakh.
Bs"d
But first he used his God given brains to figure out which God to worship.
He left the prevalent idolatry he grew up in, and worshipped the one and only true God
Y-H-W-H.
Hanging on to whatever religion you grew up in, without ever examining whether or not it is idolatry, is not getting you anywhere.
When I ask you for rational reasons why the NT is inspired by God, you cannot come up with anything.
Therefor your religion is an accident of birth. If you would have been born in a Muslim country, you would now have been defending Mohammed and Allah.
That makes you religion totally worthless. It is build on nothing. It lacks a foundation.
Use your brain, that's why God gave it to you. Not in order to switch it off when it comes to religion and to believe that 1 + 1 + 1 = 1.
There is no profit in believing idiocy.
"O Y-H-W-H, my strength and my fortress, my refuge in the day of affliction, the Gentiles shall come to You from the ends of the earth and say, 'Surely our fathers have inherited lies, worthlessness and unprofitable things.' Will a man make gods for himself, which are not gods?"
Jeremiah 16:19