Quite simply... He wouldn't. Now Judaism was at one time God's way to worship him but because of their failure to be faithful and the need to bring the gentiles on board, God sent Jesus and God's way of worship was moved to Christianity... Islam was never approved by God...and as for Christianity only one "sect" is approved by God as the way to worship...
The Bible, Torah, and the Q'uran all teach that we should love one another. The Kama Sutra was a bit more specific.
If the nature of God is different you don't worship the same God. Christians describe God as trinitarian, Jews and Muslims do not.