- If you ask without any background, many people are likely to assume you are just too lazy to do the work yourself.
- If you ask without any background, many people will likely assume you are just too lazy to do the work yourself.
Shouldn't (2) be better than (1)?
I searched for "future tense vs. present tense", but didn't find anything helpful in reference to the posed problem.
Furthermore, I found on grammar.ccc that an 'if + present tense' clause should be followed by a main clause of the form 'will + infinitive/present tense/imperative'; so, at least according to that reliable source, (1) would be wrong.
Best Answer
If-clauses that predict the future are commonly followed by a main clause with will + infinitive:
What complicates the present example is the use of the word likely. This word already has a future implication so there is no need to use will too. For example:
For this reason the first of the OP's sentence is perfectly acceptable.