From KJV 1611 American Home Bible League Word

How may I know there is a God?

Saint John 1:14 And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.

Saint John 1:18 No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him.

Saint John 14:9-14 Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayeth thou then, Shew us the Father?
Believeth thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself; bit the Father that dwelleth in me, he doth the works.
Believe me that I am in the Father, and the Father in me; or else believe me for the very works sake.
Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father.
And whatsoever ye shall ask in my name, that will I do, that the Father may be glorified in the Son.
If ye shall ask any thing in my name, I will do it.

Saint John 20:29-31 Jesus saith unto him, Thomas, because thou hast hath seen me, thou hast believed; blessed are they that have not seen, and yet have believed.
And many other signs truly did Jesus in the presence of his disciples, which are not written in this book;
But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.

Romans 1:20 For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse;

Saint John 8:47 KJV 1611 American Home Bible League Word He that is of God heareth God's words; ye therefore hear them not, because ye are not of God.