Trinity problem for Allah.

Allah HAD to create the universe in order to love! Allah is one god in one person and so there was a time when he could not love another. Allah is called a god of love but clearly there was a time he wasn’t able to love – having nothing to love. BUT Allah is also called unchanging and so clearly, if he is a god of love, then he must have changed – clearly he needed to create to love. And so Islam has a big problem.

Similar things can be pointed out to the Jehovah’s witnesses and Unitarians or anyone who denies the trinity doctrine.

But the true God of scripture is three distinct persons in one God. Therefore into eternity past they always loved each other fully and never needed to create in order to be loving. Not only that, but love is best expressed in worship and praise which is always at a minimum a corporate activity between two persons referring to and lifting up the virtues of a third. Only the triune God not only loved but also enjoyed and praised and worshipped and agreed within the Godhead for all time. The Father and the Holy Spirit praising and loving the Son. The Son and the Holy Spirit loving and worshipping the Father. The Father and the Son loving and enjoying the Holy Spirit. 
Only the triune God has not needed to create nor needed to change.

Trinity Proof (not exhaustive)

All three are called God

Gal.1:1, Eph, 4:6, Gal.1:1 Phil.1:2

Rom.9:5, Col.2:9, Jn.1:1, 1 Jn. 5:20, Rom. 9:5 Isa. 9:6, Col.2:9, Heb. 1:8

Gen. 1:2, Acts 5:3-4, 1Cor.2:11, 1 Cor.6:19, 1 Cor3:17, Isa. 11:2

All three simultaneously exist

James 1:17, Hebrews 13:8, Micah 5:2, Heb. 9:14, Matthew 3:16-17

All three were responsible for creation.

Eph. 3:14, Mal. 2:10)

Jn.1:3, Heb. 1:2 Col. 1:16

Ps. 104:30, Job 26:13, Job 33:4

Genesis 1:26

Genesis 19:24