No Christian believes Jesus was creating a new religion; per the Bible: Matthew 5:17-19 - “Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. 19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.”
Judaism and Christianity split after Christ and not all at once, and the two still share quite a lot.
There’s much more that can be said about the issue; but as you state “that Christ was not starting his own religion” is a nonsensical ‘revelation’ on many levels.
No Christian believed Jesus was planning a new church? Guess telling peter he was the rock on which he planned to build his church was a mistranslation put in by (place favorite conspiracy theory here... the claim predates Constantine so don’t try that one).
One Billion Catholic Christians and half a billion Orthodox and Eastern Christians believe Jesus founded a church. Taking one quote out of context doesn’t make them wrong.
That was my first thought as well.