Is Jesus Christ the only way to heaven? Can only He forgive our sins and grant us eternal life?

The Bible is very clear on this: Yes, Jesus is the ONLY way.

Some faction believe that the Jews are exempt from this: they can enter heaven without accepting the Lord Jesus Christ as their Saviour. However, the Bible very strongly says that whether Jew or Greek, male or female, every flesh must accept the Lord Jesus Christ.

John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.

And we also read in Acts 2:38 that Peter said unto everyone including the Jews:

Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.

Acts 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.

Apostle John claims that even the Jews cannot inherit heaven without accepting the Lord Jesus Christ:

1 John 2:23 Whosoever denieth the Son, the same hath not the Father: (but) he that acknowledgeth the Son hath the Father also.

Phil 2:10 That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth; 11 And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.

We read that finally even the Jews will accept the Lord Jesus Christ.

Isa 25:9 And it shall be said in that day, Lo, this is our God; we have waited for him, and he will save us: this is the LORD; we have waited for him, we will be glad and rejoice in his salvation.

அக்காலத்திலே: இதோ, இவரே நம்முடைய தேவன்; இவருக்காகக் காத்திருந்தோம், இவர் நம்மை இரட்சிப்பார்; இவரே கர்த்தர், இவருக்காகக் காத்திருந்தோம்; இவருடைய இரட்சிப்பினால் களிகூர்ந்து மகிழுவோம் என்று சொல்லப்படும்.