There is only one true God. He is the Creator of the heavens and earth. He is the Commander of all spiritual forces. He is the one to whom all humans will be answerable to he is the Father of all creation.
This God is one. He has only one way to Himself. He has only one way for which man should worship Him. He has shown unto us His way. This is expressly declared in His Word. The Word of God is in the Bible. This true God is the God of the Bible.
Jesus Christ is the one who reveals this God to us. He is the one who makes known to us the things that pertain to God. We are to worship this God according to the standard which He has laid down in the Bible.
Any form of worship which is outside what is prescribed in the Bible is false. Those who practice religion outside what the Bible teaches are not worshiping the true God. The true is the one who has revealed Himself to us in the Bible.
There are different kinds of worship as there are different kinds of religion. We are not all worshiping the same God. The God which we worship depends on the way we are worshiping. The true God is the one we worship according to the Bible.