Let’s just worship only one God, for Abraham only worship one God too:
“They  say: “Become Jews or Christians if ye would be guided (to salvation).”  Say thou: “Nay! (I would rather) the Religion of Abraham, the True, and  he joined not gods with Allah.” [Quran 2:135]
“Abraham  was not a Jew nor yet a Christian; but he was true in Faith, and bowed  his will to Allah’s (which is Islam), and he joined not gods with  Allah.” [Quran Ali Imran:67]
God does not forgive the sin of joining other gods with Him:
“Allah  forgiveth not (the sin of) joining other gods with Him; but He  forgiveth whom He pleaseth other sins than this: one who joins other  gods with Allah, hath, strayed far, far away (from the Right).” [Quran  An Nisaa:115]
Don’t worship more than one God:

