Where in the bible does it say to "Accept Jesus"? Maybe the same place it mentions the word "trinity".
Your question tells us all that you have not spent a lot of time reading the Bible for the answers you need.
Here are a few answers to you question. Time and room do not allow for more but I think you can get the picture.
In case you can not understand this........In Bible study and all of Theology and in fact all applied sciences it comes under the heading of............."Implied Truth".
Romans 10:9-10...........
That if you confess with your mouth, "Jesus is Lord," and believe in your heart that God raised him from the dead,
you will be saved. (10) For it is with your heart that you believe and are justified, and it is with your mouth that you confess and are saved.
1 John 5:11-12 ...........
And this is the testimony: God has given us eternal life, and this life is in his Son. (12)
He who has the Son has life; he who does not have the Son of God does not have life.
John 14:6 Jesus answered..........
"I am the way and the truth and the life.
No one comes to the Father except through me.
John 6:40 ............
For my Father's will is that
everyone who looks to the Son and believes in him shall have eternal life, and I will raise him up at the last day."
John 3:14-18...........
Just as Moses lifted up the snake in the desert, so the Son of Man must be lifted up, (15)
that everyone who believes in him may have eternal life. (16) "For God so loved the world that he gave his one and only Son,
that whoever believes in him shall not perish but have eternal life. (17) For God did not send his Son into the world to condemn the world, but to save the world through him. (18)
Whoever believes in him is not condemned, but whoever does not believe stands condemned already because he has not believed in the name of God's one and only Son.
I find it sad to say, but some people never stop to reason against reason. In the Bible, there is no explicit statement which says, “God is Creator.” But we surely can use our God-given intellect to reason and conclude from Genesis 1:1 that God is Creator—an implied statement deduced by using reason.
That applies as well to the Trinity. While it is a well know fact that the word Trinity is not in the Scriptures, the Implied Truth of reasoning makes it clear that there is in fact a Trinity. The problem is NOT whether or not there is a Godhead which is made up of the Father, Son and Holy Spirit, it is the fact that some people do not accept it.
Now as for the Trinity. The doctrine of the Trinity, an
implicit truth, is built on
explicit truths found in the Old and New Testaments:
1.
There is only one God. This is the consistent emphasis of Scripture (Deut.6:4; Isa.44:6; John5:44; 1Cor.8:4; 1Tim.2:5; James2:19).
2. The Father is God. The Father is explicitly called “God” throughout Scripture (John6:27; Rom.1:7; Gal.1:1; 1Pet.1:2).
3. Jesus is God. Jesus is explicitly called “God” (Titus2:13; Heb.1:8), and He (Jesus) claimed to be “the first and the last” (Rev. 1:17), the precise name God used of Himself in Isaiah44:6. The divine names “Yahweh” and “Elohim” are used in reference to the Messiah who is Jesus (Isa.9:6;40:3; cf. John8:58 and Exod.3:14). He performs works that only God can do, such as creating the universe (Col.1:16; cf. Isa.44:24).
4. The Holy Spirit is God. The Holy Spirit is the “Spirit of God” (Gen.1:2; Exod.31:3; Ezek.11:24; Rom.8:9,14; 1John4:2) and possesses the attributes of deity, including omnipresence (Ps.139:7‑9), omniscience (1Cor.2:10–11), and eternity (Heb.9:14). He does things that only God can do, such as participating in the creation of the universe (Gen.1:2; Job33:4; Ps.104:30), begetting Christ in Mary’s womb (Luke1:35), resurrecting Christ (Rom.8:11), and inspiring Scripture (2Tim.3:16; 2Pet.1:21).
From these explicit truths we can infer the implicit truth that within the unity of the one God are the Father, the Son, and the Holy Spirit.